Chronograph 6139

Ref. 6139-6000

discontinuedFirst-series 6139-600xPartially documentedLast reviewed Not yet reviewed

Lineage6139-60006139-6005 →Compare with next

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

Factory

Water 70m Proof

Depth wording rendered as 'Proof' at 9 o'clock, paired with a 'Proof'-marked caseback. First-year configuration.

Documented 1969–1970Probable

Dial

Factory

Water 70m Resist

Later wording, adopted across Seiko as the industry moved away from the unqualified 'waterproof' claim. A 'Resist' dial in an early case, or a 'Proof' dial in a late one, is a mismatch worth resolving — most often a service dial, occasionally a swap.

Documented from 1970Probable

Production Changes

c. 1970
'Proof' dial and caseback wording replaced by 'Resist'
Rest-of-world 6139-600x dials changed from 'Water 70m Proof' to 'Water 70m Resist', with the caseback marking following. North American -6005 and -6009 examples are reported as 'Resist' from the outset, so the transition is a rest-of-world one and cannot be applied to every 6139.

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

Seiko 6139FactoryDefault configurationHigh confidence
1969–1970