
Ref. SD1904
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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 SD1904 for its comfortable 38mm case size, which sits flat and wears well even on larger wrists, and for its very good case brushing and finishing with no sharp edges. The lume is consistently highlighted as excellent, lasting all night, and the watch is considered a great value at its $180 price point. However, one owner feels Steeldive lags behind competitors in case finishing, bracelet quality, and quality control, while another reported a bezel insert detaching and a bent crown shaft on different Steeldive models. The glossy dial can also create glare, posing challenges for photography. On balance, owners rate the STEELDIVE SD1904 highly for its excellent lume and comfortable wearability at an affordable price.
On real wrists
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