
Ref. SD1992
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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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Owners widely praise the STEELDIVE SD1992 for its perfect size and fantastic quality, with many recommending it as a great GMT option at its price point. Reviewers and owners consistently highlight the excellent lume. One owner notes the 40.5mm case is a comfortable size, and the lug-to-lug distance is important for wearability. The polished surfaces can be challenging to photograph, and the milled, polished clasp with an embossed insignia is considered polarizing by some. On balance, owners rate the STEELDIVE SD1992 highly for its excellent lume and overall quality at the price.
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