Zenith Calibre 135 Collaboration Reveals 10-Piece Platinum Masterwork

Le Locle: Zenith Watches has unveiled a rare horological partnership, introducing the Zenith Calibre 135 Double Signed edition in collaboration with Tokyo-based independent watchmaker Naoya Hida & Co. This ultra-limited ten-piece platinum release underscores a growing global demand for cross-cultural independent watchmaking collaborations that merge historical European movements with contemporary Japanese design sensibilities.

The following technical and commercial specifications detail the physical and mechanical attributes of this collaborative Zenith Calibre 135 release.

The Horological Significance of the Zenith Calibre 135

Widely regarded as the most decorated movement from the golden age of observatory chronometer trials, this calibre represents the pinnacle of mid-century precision. Originally developed in the 1950s, the movement was revived in 2022 through a collaboration with master watchmaker Kari Voutilainen. Zenith Watches introduced the G.F.J. Calibre 135 Double Signed edition in June 2026 as a ten-piece platinum limited edition.

In 2025, marking the 160th anniversary of the Le Locle manufacture, the movement was re-engineered for the G.F.J. collection, named after founder Georges Favre Jacot. The current iteration demonstrates how historical mechanics can be successfully integrated into modern luxury watch portfolios. This approach preserves the mechanical integrity of the movement while presenting it in a contemporary format.

Observatory Chronometry Heritage

The hand-wound movement operates at a frequency of 2.5Hz and features a 72-hour power reserve. This setup is paired with a Breguet overcoil and Charles Fleck's double arrow-shaped regulator for micro-adjustments. These technical elements were originally designed to withstand the rigorous testing of mid-century observatory trials.

To meet modern expectations, the movement incorporates a stop-second mechanism and spring-mounted jewel settings to protect the balance staff. These technical enhancements allow the movement to achieve an official COSC chronometer certification with a daily rate variance of just +/-2 seconds. This level of precision is exceptional for a movement designed over seven decades ago.

Modern Mechanical Restoration

The movement architecture is visible through a sapphire crystal case back, showcasing a contemporary dark ruthenium finish. This aesthetic treatment is contrasted with yellow gold-coloured markings and traditional hand-chamfered edges. The visual presentation bridges the gap between historical watchmaking and modern design preferences.

Beyond aesthetic refinements, the re-engineered movement provides an extended power reserve of 72 hours. This ensures that the historical caliber meets the performance standards expected by modern collectors of high-end horology. The combination of historical significance and modern reliability makes this release highly attractive to serious collectors who follow exquisite vintage timepiece auctions.

Design Philosophy of the Swiss-Japanese Collaboration

The collaboration between Zenith and Naoya Hida & Co. represents a deliberate meeting of Swiss mechanical heritage and Japanese minimalist design. Founded in Tokyo in 2018, Naoya Hida & Co. has established a reputation for classical proportions and extreme attention to detail. This partnership allows both brands to showcase their unique strengths in a single cohesive timepiece.

Chief Product Officer Romain Marietta initiated the project during a visit to Hida's Tokyo workshop, finding common ground in their shared appreciation for mid-century design. The resulting timepiece houses the movement within a 39.5mm platinum case that mirrors the aesthetic of Hida's NH Type 1 and Type 2 models. This case size offers a balanced presence on the wrist while maintaining classical proportions.

Pantograph Dial Engraving

The dial is crafted from solid silver, serving as a canvas for a highly traditional engraving process. All markings, including the double signatures of both brands, are carved using a vintage pantograph engraving machine. This method requires immense skill and patience, ensuring that no two dials are completely identical.

Renowned Japanese engraver Keisuke Kano hand-finishes the three Arabic numerals on the dial. These deep engravings are then filled with blue Japanese urushi lacquer, creating a subtle three-dimensional effect that changes with the light. The solid silver dial features three Arabic numerals hand-engraved by Keisuke Kano and filled with blue urushi lacquer.

Artisanal Japanese Straps

To complete the aesthetic, the watch is supplied with three distinct, locally sourced Japanese straps. The primary strap is made from Himeji Kurozan leather, which undergoes repeated hand-applications of urushi lacquer to achieve a unique, shimmering texture. This leather is highly prized for its durability and rich visual depth.

The second option features Wagyu leather prepared by Kyoto Leather, while the third is crafted from deep indigo non-stretch denim from the Kaihara Denim mill in Fukuyama, Hiroshima. Each strap is secured by a platinum pin buckle engraved with the G.F.J. initials. These straps allow the wearer to transition the watch from formal to casual settings.

The Evolution of the Luxury Watch Market

The release of this ten-piece edition reflects a broader shift in the global luxury watch market toward extreme scarcity and artisanal collaboration. Collectors are increasingly moving away from mass-produced luxury items in search of pieces that tell a story of shared craftsmanship. This trend has intensified as the global collector community becomes more knowledgeable and discerning.

This shift has allowed independent watchmakers to command significant premiums and gain equal footing with historic Swiss manufactures. By partnering with Naoya Hida, Zenith taps into a highly dedicated community of collectors who value Japanese artisanal techniques. This strategy enhances Zenith's brand equity among the most influential collectors in the industry, similar to how exclusive jewellery houses operate.

What is the price of the Zenith Calibre 135 Naoya Hida watch? While the official price is available upon request, comparable ten-piece platinum collaborations in the ultra-prime segment typically command prices exceeding CHF 100,000. This pricing structure reflects the immense labor required for hand-engraved dials and restored movements.

Strategic Significance of the Double Signed Program

The partnership marks the launch of Zenith's Double Signed Program, a strategic initiative designed to revive the historic tradition of co-branded timepieces. During the mid-twentieth century, double-signed watches from retailers or partner watchmakers represented the ultimate expression of shared heritage. This program seeks to modernize that tradition for the twenty-first century.

Under the direction of CEO Benoit de Clerck, Zenith intends to use this program to invite selected independent watchmakers to reinterpret its most iconic movements. This approach allows the brand to maintain its historical relevance while injecting fresh design perspectives into its collections. It also creates a unique platform for creative exchange between established manufactures and independent artisans, much like innovative Swiss design collaborations.

By sharing its intellectual property and legendary movements, Zenith positions itself as a collaborative leader in the watch industry. This strategy fosters goodwill among independent watchmakers and elevates the brand's standing among serious horological enthusiasts. The program represents a forward-thinking approach to heritage preservation in the modern era.

Investment Implications for High-End Horology Collectors

From an investment perspective, ultra-limited editions featuring historically significant movements represent highly resilient assets. The combination of a restored movement and a hand-finished dial creates a double-layered scarcity that appeals to global family offices and private collectors. These assets often show low correlation with traditional financial markets, providing an effective hedge.

Historical auction data indicates that double-signed watches from premier Swiss manufactures consistently outperform single-branded equivalents. The limited run of just ten pieces virtually guarantees high demand on the secondary market, protecting capital appreciation over the long term. Collectors who secure an allocation are likely to see strong interest from the secondary market, similar to the success of exceptional timepiece auctions.

Is the Zenith Calibre 135 Naoya Hida watch a good investment? Investors acquiring one of these ten platinum pieces stand to benefit from an immediate valuation premium, as demand for hand-finished independent collaborations continues to outpace supply globally in 2026. This makes the release a highly compelling acquisition for wealth preservation.

Outlook for Independent Watchmaking Partnerships

Looking ahead through the remainder of 2026 and into 2027, the success of this Swiss-Japanese collaboration is likely to inspire similar cross-border partnerships. Historic manufactures are recognizing that they must engage with independent creators to remain culturally relevant to a younger, design-conscious demographic. This trend will likely accelerate as the market for independent watchmaking continues to expand.

As wealth continues to migrate toward collectors who prize subtlety over overt display, the demand for understated, hand-crafted timepieces will continue to grow. Zenith's Double Signed Program is well-positioned to lead this market evolution by bridging the gap between industrial excellence and artisanal craft. This positioning will be critical for maintaining long-term brand relevance.

The integration of traditional Japanese crafts, such as urushi lacquer and Kurozan leather, into Swiss watchmaking highlights a growing appreciation for multicultural luxury. This trend will likely expand, with future collaborations exploring other regional artisanal techniques. Where is the Kaihara Denim mill located? The Kaihara Denim mill is located in Fukuyama, Hiroshima, where artisans produce non-stretch denim using traditional artisanal watchmaking techniques.

Conclusion

The Zenith Calibre 135 Double Signed with Naoya Hida & Co. represents a landmark achievement in modern horology, demonstrating that legacy is not static but a canvas for continuous renewal. By housing a legendary observatory chronometer movement within a meticulously hand-finished Japanese design, this ten-piece platinum edition sets a new benchmark for collaborative watchmaking. For the global collector, it offers a rare opportunity to acquire a piece of shared horological history that will undoubtedly remain a focal point of discussions for decades to come.

Disclaimer: This article is based on publicly available information and is intended for informational purposes only. LuxuryAbode.com does not independently verify all facts and figures mentioned. Readers are advised to conduct their own due diligence before making any investment or business decisions based on this information. The content should not be construed as financial, legal, or professional advice.