Some specifications for this reference are on file; the record is incomplete.
Seiko · Vintage
Chronograph 6138
Ref. 6138-0011 — “UFO”
discontinuedLugless 'Yachtsman' casePartially documentedLast reviewed Not yet reviewed
Missing informationCore fields not yet documented for this reference: Case diameter, 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
1970–1979