![Seiko Sports 100 7A28 "First Analog Quartz Chronograph Movement" Vintage Watch Hands-On | aBlogtoWatch Seiko Sports 100 7A28 "First Analog Quartz Chronograph Movement" Vintage Watch Hands-On | aBlogtoWatch](https://www.ablogtowatch.com/wp-content/uploads/2017/06/Seiko-Sports-100-Titanium-7A28-7060-watch-31.jpg)
Seiko Sports 100 7A28 "First Analog Quartz Chronograph Movement" Vintage Watch Hands-On | aBlogtoWatch
![Seiko Sports 100 7A28 "First Analog Quartz Chronograph Movement" Vintage Watch Hands-On | aBlogtoWatch Seiko Sports 100 7A28 "First Analog Quartz Chronograph Movement" Vintage Watch Hands-On | aBlogtoWatch](https://www.ablogtowatch.com/wp-content/uploads/2017/06/Seiko-Sports-100-Titanium-7A28-7060-watch-4.jpg)
Seiko Sports 100 7A28 "First Analog Quartz Chronograph Movement" Vintage Watch Hands-On | aBlogtoWatch
![Sold at Auction: Two vintage Seiko quartz wrist watches including a ref. 7A28- 7009 Sports 100 chronograph Sold at Auction: Two vintage Seiko quartz wrist watches including a ref. 7A28- 7009 Sports 100 chronograph](https://image.invaluable.com/housePhotos/schmitt/34/677234/H1101-L215736777.jpg)
Sold at Auction: Two vintage Seiko quartz wrist watches including a ref. 7A28- 7009 Sports 100 chronograph
![Seiko Sports 100 7A28 "First Analog Quartz Chronograph Movement" Vintage Watch Hands-On | aBlogtoWatch Seiko Sports 100 7A28 "First Analog Quartz Chronograph Movement" Vintage Watch Hands-On | aBlogtoWatch](https://www.ablogtowatch.com/wp-content/uploads/2017/06/Seiko-Sports-100-Titanium-7A28-7060-watch-29.jpg)
Seiko Sports 100 7A28 "First Analog Quartz Chronograph Movement" Vintage Watch Hands-On | aBlogtoWatch
![1983 SPORTY SEIKO 7A28-7040 SPEEDMASTER SPORTS 100 CHRONOGRAPH QUARTZ VINTAGE | WatchCharts Marketplace 1983 SPORTY SEIKO 7A28-7040 SPEEDMASTER SPORTS 100 CHRONOGRAPH QUARTZ VINTAGE | WatchCharts Marketplace](https://cdn.watchcharts.com/listings/e94fa01b-71ff-400b-a6e7-5b464c94bc9a.png)