
Ref. SD1906S
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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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Owners widely praise the STEELDIVE SD1906S as an exceptional value, with its case finishing noted as surprisingly good for the price, featuring superior linear brushing on the case back. The watch is frequently cited as a favorite everyday wear, with one owner reporting successful dives to 100 meters without issue. Lume is consistently highlighted as excellent, lasting all night. Some owners report issues with bracelet quality, specifically a poorly applied logo, leading them to swap it for a strap, while others have experienced component failures like bezel inserts popping out or bent crown shafts on different models. The glossy dial is noted as making photography challenging. Overall, owners rate the STEELDIVE SD1906S highly for its impressive build quality and lume at its price point.
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