Time Spec: Seiko 7A28 RAF Gen 1 Chronograph - Worn & Wound
The Seiko 7A28-7010: A Case for Collecting Vintage Quartz Watches | Two Broke Watch Snobs
The 1983 Seiko synchrotimer, reference #7a287039. The first analog quartz chronograph, and the first analog chronograph to have sub seconds dial. : r/ Seiko
Seiko Chronograph, Cal. 7A28
Buying Your First Vintage Seiko Chronograph | WatchGecko
Seiko | The First Quartz Watch | The First GPS Solar Clock | The First Titanium Case Dive Watch | Astron
Seiko 7a28 701a | World first quartz chronograph 82' OLYMPUS… | Flickr
Minty Seiko 7a28-703b World's First Analog Quartz Chronograph, Luxury, Watches on Carousell