My newest catch, working vintage Seiko stopwatch. Dial says [90-5060T] and back says [90-5040]. The movement says Seikosha, Seiko branch. I cannot find more details, or production year. Anyone more info? :
Seiko mechanical stopwatch | Wrist Sushi - A Japanese Watch Forum
Rare SEIKO Mechanical Stop Watch Large Vintage Seiko Chronograph ACRP 90-5020 - Etsy UK
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Vol.9 Legibility, accuracy, and functionality. The design of stopwatches. | by Seiko watch design
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