Seiko
A Seiko (TMI / Seiko Instruments) automatic GMT caliber — the export-market designation of the Seiko 4R34 — that adds a 24-hour fourth hand to the NH35 / 4R35 base. It runs at 21,600 vph with about 41 hours of power reserve, hacks and hand-winds, and has become the default affordable GMT for microbrands.
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The San Martin Diver GMT SN0136 is praised for its sunburst blue dial, solid bracelet, and 39mm case size, which owners find wearable and versatile. The watch features a GMT function and a 60-minute timing bezel, with design enhancements like updated hour markers and a colored GMT hand improving legibility. Some owners find the Seiko NH34 movement to be inferior to others, though its longevity is also praised. Overall, owners rate the San Martin Diver GMT SN0136 highly for its striking blue dial and comfortable 39mm case size.
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