![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-5.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-29.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
![Seiko Chronograph 7A38-7120 Titanium Vintage Sports 100 for $403 for sale from a Private Seller on Chrono24 Seiko Chronograph 7A38-7120 Titanium Vintage Sports 100 for $403 for sale from a Private Seller on Chrono24](https://cdn2.chrono24.com/images/uhren/31216017-beo9ki2h6wbnijwvqszaxxdb-ExtraLarge.jpg)
Seiko Chronograph 7A38-7120 Titanium Vintage Sports 100 for $403 for sale from a Private Seller on Chrono24
![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)