The Simple Pleasure of Seiko Vintage Quartz - A Primer in Five Watches - The Time Bum
Seiko Astron: World's First Quartz Watch Turns 40 | aBlogtoWatch
Astron (wristwatch) - Wikipedia
Seiko Marks 50 Years of the Watch that Started the Quartz Crisis | SJX Watches
A tribute to a watchmaking revolution. The 50th anniversary of the Quartz Astron is celebrated in a limited edition GPS Solar watch. | Seiko Watch Corporation