When East Meets Swiss: The Zenith G.F.J. Calibre 135 Double Signed with Naoya Hida & Co.
There are moments in watchmaking when two creative forces align so naturally that the result feels less like a collaboration and more like an inevitability. The G.F.J. Calibre 135 Double Signed with Naoya Hida & Co. is one of those moments — a platinum dress watch limited to just 10 examples worldwide that pairs one of Switzerland's oldest and most storied manufactures with the most coveted independent watchmaker to emerge from Japan in a generation. The result is a watch that simultaneously honors the mid-twentieth century's golden age of mechanical horology and announces a bold new chapter for both brands. At $75,000, it is not a casual acquisition. But for serious collectors, it may well be one of the most meaningful pieces released anywhere in 2026.
The Double Signed Tradition: A Collector's Language Reborn
To understand what makes this watch significant, you first have to understand what a double-signed watch actually represents to the people who hunt them. Double-signed watches are well established as highly collectible within the watch community. Historically, they were usually the product of a large, well-known retailer having its logo printed on the dial alongside the name of the manufacturer. The most enduring examples of the form — Tiffany & Co.-stamped Rolex and Patek Philippe pieces — are the most famous of all, and Tiffany co-branded watches command a premium by default, with some achieving astounding results at auction.
The double-signed format carries a special appeal because vintage collectors tend to love retailer-signed and co-signed watches — they capture a specific moment in watchmaking history. Zenith is clearly trying to tap into that atmosphere here. But what the brand is doing with its new Double Signed Program is subtly and importantly different from the old model. Rather than reviving the double signature purely as a retailer-driven tradition, the manufacture is using it as a platform for collaboration with independent watchmakers. Here, it appears that Zenith will be working with independent watchmakers who will have an opportunity to create something unique based on historic Zenith references. It is a reframing of a beloved concept — and in choosing Naoya Hida & Co. as its inaugural partner, Zenith set the bar almost impossibly high for whatever comes next.
The Calibre 135: A Movement Forged in Competition
Before getting to the collaboration itself, it is worth dwelling on what the Calibre 135 actually is and why it matters. This is not a movement invented to fill a product gap. Its origins are tied directly to one of the most demanding proving grounds mechanical timekeeping has ever known.
Observatory Trials and the Golden Age of Precision
When Zenith, celebrating its 160th anniversary, revived the Calibre 135 in 2025 with the launch of the G.F.J. collection, the manufacture brought back one of the most important precision movements — a calibre that dominated observatory chronometry competitions throughout the 1950s and remains the most awarded movement of its kind. The numbers alone are staggering. The original Calibre 135-O comes from the golden age of horology, where Zenith was routinely participating in chronometry competitions, gaining 2,333 chronometry prizes in total. Of those, 235 were won with the Calibre 135-O, which was produced from 1949 to 1962.
The hand-wound Calibre 135 is based on a movement of the same name developed in 1943 for observatory competitions — the most prestigious mechanical timekeeping trials of the age. When Zenith began reengineering it for the modern G.F.J. collection, the goal was not to simply reproduce a museum piece. The movement inside is a modern re-creation of the Calibre 135-O. Utilizing the same basic architecture of the original, the Breguet overcoil, and 2.5 Hz beat rate, the modern Calibre 135 is updated to include a 72-hour power reserve and a stop-second mechanism. This COSC-certified movement features a Breguet hairspring, stop seconds mechanism, a variable inertia balance wheel and a double-arrow-shaped regulator. It packs a 72-hour power reserve and is accurate to within 2 seconds per day.
G.F.J.: Named for the Founder
In 2025, a full modern revival began with Zenith re-engineering the Calibre 135 for the G.F.J. collection, named after the manufacture's founder, Georges Favre-Jacot. That watch translated the spirit of the original calibre into a contemporary wristwatch, combining a manually wound chronometer movement with classical finishing, modern reliability, and carefully considered case and dial materials worthy of the movement inside. Zenith continued to build on that momentum at Watches and Wonders 2026 with new G.F.J. executions in yellow gold with bloodstone and tantalum with onyx. The Double Signed edition arrives on the back of that momentum, adding a third dimension to the G.F.J. story — one written in a distinctly Japanese hand.
The Voutilainen Precedent
This is not the first time Zenith has invited an outside craftsman to interpret its most celebrated calibre. Following the highly acclaimed 2022 collaboration with Kari Voutilainen, which saw ten original Calibre 135-O observatory movements from the 1950s meticulously restored and finished, Zenith now turns to Japanese watchmaker Naoya Hida for a distinctly different interpretation of the historic movement. The Voutilainen project dealt with original vintage movements — physical artifacts from the height of Zenith's competitive era. The Naoya Hida collaboration is something else entirely: a forward-looking creative partnership built around a modern reinterpretation of that heritage.
Who Is Naoya Hida? The Man Behind Japan's Most Coveted Independent
Ask any serious collector to name the most exciting Japanese independent watchmaker working today, and the same name surfaces immediately. The emergence of Naoya Hida as a major player in the independent space has been one of the more exciting developments in watches over the last few years. Whether his watches are to your taste or your budget, there's no denying that the brand presents a crystal clear point of view and takes no shortcuts to execute on it. In an environment with frankly a lot of half-baked ideas, there's something satisfying about a brand that knows exactly what it is.
Three Decades Before the First Dial
Hida did not arrive at watchmaking through the traditional route of apprenticeship or technical school. His path was longer and in some respects more unusual — and it is precisely why his design instincts are so acute. Naoya Hida started in the watch industry back in 1990, on the commercial side. For three decades he amassed brands like Audemars Piguet, Breguet, Daniel Roth, Ebel, Eterna, F.P. Journe, Harry Winston, Jaeger-LeCoultre, Maurice Lacroix, Roger Dubuis, Ulysse Nardin, and Vacheron Constantin on his CV. He was not making watches — he was distributing the finest ones in the world to the Japanese market, studying their proportions, their typography, their finishing standards, and the logic behind every design decision that separated the good from the genuinely great.
After working in the industry for decades, Hida decided to launch his own brand in order to create his ideal wristwatch — namely, mid-century inspired designs refined with Japanese sensibilities. The opportunity to act on that conviction solidified around 2012, when he connected with two craftsmen who would become the core of his small team. At the time, he was working as brand manager for Ralph Lauren Watch & Jewelry at Richemont Japan. That's when he met two craftsmen who shared his mindset: Kosuke Fujita, then a watchmaker at Seiko, and Keisuke Kano, an engraver at Tiffany Japan.
A Workshop of Three
The Naoya Hida & Co. operation is deliberately, almost defiantly small. The company is made up of three men: founder and CEO Naoya Hida, watchmaker Kosuke Fujita, and engraver Keisuke Kano. Their individual credentials read like a who's who of precision craftsmanship. The brand deliberately maintains a small team structure, and this directly impacts the product's character: Kosuke Fujita is a graduate of Hiko-Mizuno Watchmaking School who worked in F.P. Journe and Seiko service structures and is a WOSTEP-certified first-class technician — he joined NH WATCH in 2020 and handles the CAD design and assembly side. Keisuke Kano has experience in jewelry watchmaking at Seiko Epson and later in engraving at Tiffany Japan; he joined in 2022 and handles many handcrafted operations, including dial engraving.
The Japanese brand produces around 100 watches per year. Hida and his team do everything in-house using legacy machines and craft as much as possible by hand. Each year, a catalog is released, and customers can purchase one of a select allotment of each watch before it is produced. That last detail is critical to understanding the brand's cachet. Watches can only be purchased from Naoya Hida on application. Hida reveals his new watches, opens an application window for potential buyers, and then selects who can buy one of his watches that year from the applications he receives. The wait list is not a marketing gimmick — it is a structural reality of a workshop that simply cannot produce more than it does.
A Design Language Decades in the Making
Naoya Hida founded his brand focusing on watches inspired by the so-called golden age of mechanical watchmaking from the 1930s through the 1960s. The brand combines traditional handcraft with modern manufacturing technology, but the emphasis always stays on proportion, typography, finishing, and subtle detail rather than visual spectacle. Naoya Hida watches exhibit a design philosophy that appears calm at first glance but multi-layered upon closer inspection: small diameters, balanced bezels, classic fonts, and details such as hand-engraving on the dial. This is supported by high-precision micro-machining in areas such as measurement scales and the brand logo. There are a few recurring signatures that set Naoya Hida's universe apart — hand-engraved indexes, whether Breguet Arabic or Roman: in many models, the indices are not applied but are directly hand-engraved.
The brand is celebrated for a classical Japanese aesthetic sensibility applied to traditional European watchmaking — spare, considered, and executed to a finishing standard that has earned recognition at the Grand Prix d'Horlogerie de Genève. Hida stands out for his controlled, fine touch. His creations always feel rooted in history without ever appearing dramatic or sentimental. In a collector market saturated with brands claiming mid-century inspiration as a selling point, that distinction is everything.
How the Collaboration Came Together
The connection between the two brands reportedly began during a visit by Zenith's Chief Product Officer, Romain Marietta, to Naoya Hida's Tokyo workshop. During that meeting, they discussed their shared appreciation for this period of watchmaking, which established the roots for this collaboration. It was not a cold pitch or a strategic marketing exercise. It was a conversation between two parties who already understood each other's values before any formal proposal was made.
The logic of the pairing becomes even clearer when you consider Hida's personal history with the Calibre 135. According to Zenith, Hida had admired the Calibre 135 since the 1990s, giving the project significance for the Japanese indie house. Naoya Hida's interest in this collaboration came predominantly from his fascination with the Calibre 135 — a legendary movement from the mid-20th century that won multiple chronometry awards. It's a calibre he has admired and studied for decades, so the opportunity to collaborate on a watch housing the modern, re-engineered version launched in 2025 was a dream come true.
In his own words, Hida explained the spirit he brought to the project: "I have been captivated by the Caliber 135 since discovering it in the 1990s. Being offered the opportunity to reinterpret the G.F.J. with Zenith was both a surprise and a delight. The idea was to capture the atmosphere and spirit of the Calibre 135 era in a modern way. I aimed for something restrained, yet with deep dimensionality… Passion is essential to watchmaking; it cannot exist without it. My greatest joy is being able to create a watch like this — one that truly means something to me."
The Watch Itself: Every Detail Examined
The Case
The platinum case carries the same design and specs as previous G.F.J. models, measuring 39.15mm in diameter, 10.5mm thick, 45.75mm lug-to-lug, with 50 metres of water resistance and sapphire crystals front and rear. Elegant, stepped lugs, a slim polished bezel, and balanced proportions give the watch a refined presence, while its compact size brings out its vintage-inspired character. It is finished with a mirror polish that emphasizes the precious metal's distinct luster. Platinum, rather than gold or steel, is the correct choice here — its cool, slightly blue-white tone reads under light with a density that neither yellow gold nor white gold can quite replicate, and it gives the whole object a sense of gravitas without ostentation.
The Dial: Where Hida's Hand Is Unmistakable
The dial is where the Naoya Hida influence asserts itself most completely, and it is nothing short of extraordinary for someone familiar with the brand's work. Presented in a 39.15mm platinum case, the time-only watch draws inspiration from Hida's NH Type 1 and NH Type 2 models. The solid silver dial embodies his preference for clarity and proportion, while showcasing an extraordinary level of hand craftsmanship.
All inscriptions, including the dual signatures of Zenith and Naoya Hida & Co., are engraved using a traditional pantograph engraving machine. The three Arabic numerals are individually hand-finished by renowned Japanese engraver Keisuke Kano before being filled with deep blue urushi lacquer, creating a subtle contrast and remarkable sense of depth. The numerals have lots of depth, texture, and presence because they are cut into the dial rather than applied to its surface. That distinction between engraved and applied indices is one of the most meaningful technical separations in fine dial-making — an engraved numeral catches light from below its surface, creating a dimensionality that no printed or applied marker can approach.
In a nod to Zenith's history, the engravings have been filled with blue lacquer — a signature color for the brand, and a departure from Hida's typical black infill. This is a thoughtful concession that reveals the collaborative nature of the piece: the dial is unmistakably Hida's in form and craft, yet it wears Zenith's color as a signature of shared authorship. The solid silver dial surface absorbs and diffuses reflection rather than amplifying it, producing low-glare visual stability under variable lighting conditions.
The Hands
The slender hour and minute hands are milled from solid gold using ultra-precise CNC machining before being hand-polished by a team led by master watchmaker Kosuke Fujita. A heat-blued steel small-seconds hand completes the display. Rounded hour and minute hands, borrowed from Naoya Hida & Co.'s Type 2C line, are solid white gold, machined and polished by hand. The blued seconds hand is a detail with genuine historical resonance — heat-blued steel hands were ubiquitous in the finest Swiss dress watches of the 1940s and 1950s, and their use here reinforces the period authenticity that both parties clearly care about.
The Movement
Turning the watch over reveals the modern incarnation of the Calibre 135 through a sapphire crystal caseback. The movement features broad Geneva stripes, hand-finished bevels, and a dark ruthenium treatment accented by gold-colored markings. The movement is decorated with broad Geneva striping and hand-chamfered edges, and is regulated to -2/+2 seconds per day. The ruthenium treatment gives the movement an unusual, slightly dark visual character that sets it apart from the typical bright rhodium-plated finish — it suits the serious, scholarly nature of the watch perfectly, without veering into theatrical darkness.
The Straps: Japan in Three Materials
One of the most quietly impressive aspects of this collaboration is the strap package, which reads like a curated tour through some of Japan's finest material traditions. Buyers receive three handcrafted options: a Himeji Kurozan leather strap finished with layers of traditional urushi lacquer, a strap crafted from premium Wagyu leather by Kyoto Leather artisans, and a deep indigo Japanese denim strap produced by the renowned Kaihara Denim mill in Hiroshima Prefecture. Each is fitted with a platinum pin buckle engraved with the initials G.F.J. The Kaihara denim strap in particular is a remarkable piece of material sourcing — the indigo Japanese non-stretch denim from Kaihara Denim in Hiroshima is among the most respected heritage denim produced anywhere in the world, and seeing it appear in a high-horology context is the kind of lateral thinking that distinguishes a genuinely considered collaboration from a co-branding exercise.
Industry Implications: What the Double Signed Program Signals
Beyond the watch itself, the structural announcement embedded in this release is arguably just as important for where the industry is heading. This release introduces Zenith's Double Signed Program. Historically, double-signed watches occupy a special place among collectors, often representing relationships between watchmakers and retailers, distributors, or important partners. Rather than reviving the double signature purely as a retailer-driven tradition, the manufacture is using it as a platform for collaboration with independent watchmakers. It's a smart move, particularly with the G.F.J. The watch is already a statement about Zenith's past, so inviting outside voices to reinterpret it gives the collection room to evolve without losing its connection to the Calibre 135.
This matters because it charts a middle path that few large manufactures have found. Major Swiss houses have historically been protective of their creative turf — collaborations with outside designers, when they happen, tend to be marketing-driven affairs where the outside party's contribution amounts to a colorway or a new strap. What Zenith is proposing with the Double Signed Program is genuinely different: ceding meaningful creative control over one of its most historically significant references to makers whose aesthetic sensibilities may not have been invented in Le Locle. Through this program, Zenith plans to collaborate with respected watchmakers from around the world.
If anything, this sets a very high bar for the future co-signed watches Zenith announces here. The Voutilainen collaboration established the Calibre 135's revival credentials. The Naoya Hida edition establishes the Double Signed Program's creative ambitions. Whoever comes next will be measured against both.
Rarity, Price, and the Reality of Acquisition
Zenith limits the watch to 10 pieces and prices it at €65,900 / US$75,000 / £57,400 / CHF 58,900. Ten pieces is not a production run — it is barely an edition. And given that the G.F.J. Calibre 135 Double Signed is already sold out, the conversation about acquiring one has already shifted from retail to secondary market. For the collector who missed the allocation window, the watch now exists primarily as a reference point — a benchmark for what this kind of East-meets-Swiss collaboration can achieve when both parties bring full commitment to the table.
The price, steep as it is, reflects multiple layers of value. There is the platinum case. There is the COSC-certified manually wound movement with its 72-hour power reserve and its competition-proven architecture. There is the solid silver dial hand-engraved by one of Japan's finest craftsmen using a traditional pantograph machine. There are hands milled from solid gold and hand-polished by a master watchmaker. And there are three straps, each sourced from a specific Japanese artisanal tradition. At $75,000 for 10 examples, it is not cheap — but the cost-per-unit of human craft embedded in this piece is genuinely extraordinary.
Historical Parallels and the Longer View
The watch world has seen significant East-West crossovers before, but rarely with this particular dynamic. Japanese brands have collaborated with Swiss movement suppliers for decades, and Swiss brands have sourced Japanese dials and straps as accent materials. What is different here is the directional flow of creative authority. This is a rare Switzerland and Japan team-up, with Zenith unveiling a collaboration with enthusiast favourite Naoya Hida & Co. — not just a new watch, but a platform for collaborative models with select partners.
The deeper parallel may be to the great retailer-signed pieces of the mid-twentieth century, when Tiffany & Co. dials on Patek Philippe movements created objects that were greater than the sum of their parts — not because either party was diminished by the arrangement, but because the relationship itself communicated something about taste, trust, and shared values. The idea of a double-signed watch carries a special appeal. Historically, such pieces celebrated partnerships between prestigious manufacturers and important retailers, becoming some of the most desirable watches of their era. Zenith and Naoya Hida are proposing something similar for the current moment — an era in which independent watchmakers have become the most culturally significant voices in high horology, and in which a co-signature from the right independent carries as much weight as any retailer stamp once did.
The Verdict
Founded in 2018, the Japanese indie brand has quickly earned a devoted following among collectors thanks to its meticulous execution, restrained aesthetics, and appreciation for mid-century watchmaking. Hida's watches are often praised for their extraordinary attention to typography, proportions, and finishing, but also for classical design inspirations such as the mid-century Calatravas — qualities that make him a particularly natural collaborator for a project centered around the historically significant Calibre 135.
The collaboration makes a ton of sense, as Hida embodies the design language of the era of this movement better than most. There is no artificiality in what either party brings to this watch. Zenith's Calibre 135 genuinely belongs to the period that Hida has spent his professional life studying, admiring, and ultimately building his creative identity around. When Hida says the project meant something to him personally, the watch itself confirms it — in the engraved numerals, in the choice of urushi blue, in the restraint of a dial that could easily have been overloaded and wasn't.
For the ten collectors who secured an example, this is not merely a timepiece. It is a document of a specific moment when two entirely different watchmaking cultures — one rooted in a Le Locle manufacture founded in 1865, the other born from a Tokyo workshop that released its first watch in 2019 — found exactly the right common ground. That kind of alignment is rare in any era of watchmaking. In the current one, it is almost unheard of.
