Vol.9 Legibility, accuracy, and functionality. The design of stopwatches. | by Seiko watch design
watches88. Seiko Digital Countdown Timer And Stopwatch QHY001Y
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? :