
Ref. SD1975S
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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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3 colorways
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Owners widely praise the STEELDIVE SD1975S for its surprising build quality and fit and finish, which are considered well above its price point, with one owner noting all elements, including the date wheel, chapter markers, and bezel, are aligned. The watch is described as an attractive tuna-style design, and it has been pressure tested to 300 meters without issue. Some owners are deterred from purchasing the STEELDIVE SD1975S due to the perceived solid quality of other variants at a similar price. On balance, owners rate the STEELDIVE SD1975S highly for its robust construction and excellent value.
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