Seiko
Seiko's third-party supply version of the 4R35, sold to external watch brands and modders worldwide. Adds hacking and hand-winding over the 7S26 it effectively replaced. The NH35 has become the default automatic movement for watch modding and microbrand watches, thanks to its low cost, reliability, and wide availability of compatible parts including dials, hands, and cases in the Seiko-compatible format.
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The San Martin Watchdives X NH35 Titanium 39mm Dive SN0121T earns consistent praise from owners for its excellent case and bracelet finishing, light titanium construction, smooth bezel and crown action, and solid build tolerances at under $300—with one owner calling it the best-put-together homage they own. The case runs under 12mm thick and features grade 5 titanium with a grade 2 titanium bracelet and toolless micro-adjust clasp. However, bracelet tolerances are loose with sharp case/clasp edges, and owners with larger wrists (7.25"+) report minimal adjustment room; the movement runs notably noisier than steel variants and exhibits typical NH35 timekeeping variance. Overall, owners rate the San Martin Watchdives X NH35 Titanium highly for its finishing, titanium build, and tactile clasp action at the price, though bracelet fit and movement noise are trade-offs for the material choice.
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