Some specifications for this reference are on file; the record is incomplete.
Seiko · Astron
Astron
Ref. 35SQ Astron — “The first quartz wristwatch”
discontinuedFirst production quartz wristwatchPartially documentedLast reviewed Not yet reviewed
Missing informationCore fields not yet documented for this reference: Water resistance
Component compatibility
What this reference is documented to have carried, and in what capacity. A service part is the manufacturer's own work; only a counterfeit classification is a finding against the watch.
Documented calibers
1969–1970