Horology & History on Twitter: "A few watches stand out for their relation to 1964 and the Olympic Games in Tokyo, they are the Seiko World Timer 6217-7000, the Seiko Monopusher Chronographs -
Seiko 5717-8990 one button chronograph | The Watch Bloke
F.S. Seiko 5717-8990 | WatchCharts
Seiko 5717-8990 one button chronograph | The Watch Bloke
Seiko Mono-pusher Chronograph 5717-8990 | Wrislabs Store
FS 1965 SEIKO 5717-8990 FIRST CHRONOGRAPH | WatchCharts
Sold at Auction: GENTLEMAN'S VINTAGE SEIKO CHRONOGRAPH MONOPUSHER "OLMPICS"
Seiko One push chrono 5717-8990 Good Accuracy UNUSED NM | eBay