![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? : 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? :](https://i.redd.it/0x261m7m7cg71.jpg)
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? :
![นาฬิกาจับเวลาไซโก ของวินเทจ Made in Japan SEIKO 89ST 1960 Tokyo Olympics Split second stopwatch | Lazada.co.th นาฬิกาจับเวลาไซโก ของวินเทจ Made in Japan SEIKO 89ST 1960 Tokyo Olympics Split second stopwatch | Lazada.co.th](https://img.lazcdn.com/g/ff/kf/Sa3e41465b44445518e00341f6f0f60e24.jpg_720x720q80.jpg)
นาฬิกาจับเวลาไซโก ของวินเทจ Made in Japan SEIKO 89ST 1960 Tokyo Olympics Split second stopwatch | Lazada.co.th
![1964 year Tokyo Olympic official clock SEIKO 89ST 1/100 second machine 1/100 second measurement world most high precision. machine stopwatch : Real Yahoo auction salling 1964 year Tokyo Olympic official clock SEIKO 89ST 1/100 second machine 1/100 second measurement world most high precision. machine stopwatch : Real Yahoo auction salling](https://auctions.c.yimg.jp/images.auctions.yahoo.co.jp/image/dr000/auc0506/users/ec45affcfe80e29d61d6e800ee85256f14db6479/i-img1024x768-1560698102a1sje1705830.jpg)
1964 year Tokyo Olympic official clock SEIKO 89ST 1/100 second machine 1/100 second measurement world most high precision. machine stopwatch : Real Yahoo auction salling
![SEIKO split second stopwatch ref.89ST Box & Papers era:1964 TOKYO OLYMPICS timer | WatchCharts Marketplace SEIKO split second stopwatch ref.89ST Box & Papers era:1964 TOKYO OLYMPICS timer | WatchCharts Marketplace](https://cdn.watchcharts.com/listings/e0e629ee-953b-46ab-880b-404a197a343f.jpg)
SEIKO split second stopwatch ref.89ST Box & Papers era:1964 TOKYO OLYMPICS timer | WatchCharts Marketplace
![SEIKO split second stopwatch ref.89ST Box & Papers era:1964 TOKYO OLYMPICS timer | WatchCharts Marketplace SEIKO split second stopwatch ref.89ST Box & Papers era:1964 TOKYO OLYMPICS timer | WatchCharts Marketplace](https://cdn.watchcharts.com/listings/167969c2-8700-46b9-9338-c9dda976bcf9.jpg)