For your consideration, a Tissot winding stem, part #401 for the vintage Caliber 781-1 and Caliber 2451 movement series. Because Tissot built an incredibly interchangeable keyless works system during the late 1960s and 1970s, this single solid winding stem cross-references seamlessly across both manual-wind and automatic variants. Dimensions are thread diameter: Tap 10 (0.90 mm). It natively screws into standard 0.90 mm threaded vintage Tissot-signed crown. Stem Format: Solid Winding Stem (Standardized globally under Swiss designation Part 401). Thanks for looking.
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