Some specifications for this reference are on file; the record is incomplete.
Seiko · Vintage
Chronograph 6138
Ref. 6138-0030 — “Bullhead”
discontinuedTop-pusher 'Bullhead' casePartially documentedLast reviewed Not yet reviewed
Missing informationCore fields not yet documented for this reference: Case diameter, Water resistance
Known Variants
Classification
FactoryDocumented as shipped from the factory for this reference and period.PeriodNot original to this watch, but correct for its production period.ServiceFitted by the manufacturer's own service network. Not a defect.AftermarketThird-party part. Affects originality, not authenticity.ModifiedGenuine parts in a configuration the factory did not sell. Affects originality and value, not authenticity.CounterfeitDeceptive reproduction intended to pass as genuine.UnknownEvidence on file does not settle the question.Dial
FactoryBrown with gold subdials
Reddish-brown dial and matching bezel inlay, subdials in a gold tone.
Probable
Dial
FactoryBlack with blue subdials
Black dial and bezel inlay, subdials in a blued tone.
Probable
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
Whole production