Zenith has a new collaboration program called Double Signed, and its first partner is Naoya Hida & Co. The watch is the Zenith G.F.J. Calibre 135 Double Signed with Naoya Hida & Co., and it pulls two very different worlds together: a Swiss manufacture celebrating its 160th anniversary and a Japanese independent that has quietly become one of the most admired names in the collector community.
A bit of context helps here. Zenith revived the Calibre 135 in 2025 under the G.F.J. banner. The movement is historically significant, the most decorated precision movement of its kind, dominating observatory chronometry competitions in the 1950s. The G.F.J. line brought it back into production, and now Zenith is using that platform to invite outside creative voices in. Naoya Hida is the first.
Hida has built his brand on restraint, deep Japanese craft references, and a very specific aesthetic logic. You either get it immediately or you wonder what the fuss is about. Either way, the brand has a clear point of view, and that's exactly what makes this pairing interesting.
What Naoya Hida Actually Changed
This isn't just a dial swap with two signatures stamped on the caseback. Hida's involvement shaped the watch's visual character in ways that are recognizable to anyone familiar with his output. The dial is silver and engraved, with a texture and finish that reflects the handcraft sensibility his brand is known for. The overall presentation leans quieter and more considered than a standard G.F.J., which already sits at the restrained end of Zenith's current lineup.
The double-signed element is literal: both Zenith and Naoya Hida & Co. put their names on the dial. That's a meaningful gesture from a manufacture of Zenith's scale, and it signals that this isn't just a marketing exercise with a famous face attached.
The Movement Is Still the Story
Whatever you think of the collaboration angle, the Calibre 135 is genuinely worth your attention. This movement won more observatory trials than any other in its era. Zenith's decision to bring it back as a running, produced calibre rather than just a museum piece says something about how seriously the brand is treating this anniversary.
The movement specs carry weight here. The Calibre 135 is a high-frequency precision movement with a history built on accuracy, not complication. Its revival in the G.F.J. collection means you're wearing something with a direct lineage to competitive observatory chronometry, not a modern reinterpretation designed to look vintage.
Who This Watch Is For
This is a niche watch for a specific kind of collector. You'd need to care about movement history, appreciate Japanese craft aesthetics, and be comfortable with the understated register that both brands operate in. It's not the watch for someone who wants maximum visual impact on the wrist.
- Collectors already following Naoya Hida & Co. who want something with deeper horological infrastructure
- Zenith enthusiasts drawn to the G.F.J. line who want the most distinctive version available
- Anyone interested in serious cross-cultural watchmaking collaborations rather than celebrity tie-ins
- Buyers who value engraved silver dials and handcraft finishing over printed indexes and applied markers
- People with patience: expect this to be limited, and expect demand to outpace supply
How It Fits in the G.F.J. Line
The G.F.J. collection started with restored vintage-powered editions in 2022, moved into new production references in 2025 and 2026, and has now added a collaboration tier. That's a logical progression, and the Double Signed label gives Zenith room to bring in more creative partners without disrupting the core line.
Compared to the standard G.F.J. releases, this one sits higher in terms of exclusivity and probably price, though official pricing hasn't been confirmed across all outlets at time of writing. The silver engraved dial alone represents additional work over a printed or lacquered surface, and the co-signed status adds collector premium on top of that.
The Double Signed program is a smart idea, and Naoya Hida is a strong first choice. If Zenith picks its future partners with the same care, this could become one of the more interesting ongoing series in the manufacture's lineup. Worth watching closely.
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