Quartz-Astron 35SQ (35-9000), the world's first quartz wristwatch introduced in December of 1969. #seiko #quartzastron #seikoastron #35s... | Instagram
Quartz-Astron, the world's first quartz watch
Quartz-Astron, the world's first quartz watch
Astron (wristwatch) - Wikipedia
How many Astron were really produced?
How the launch of the Seiko Astron - the world's first commercial quartz - rocked the watch world 50 years ago