Knowledge Center

Professional Authentication Platform

Log InRegister

Some specifications for this reference are on file; the record is incomplete.

Seiko · Prospex

Willard / Captain Willard

Ref. 6105-8110 — “Captain Willard”

discontinuedAsymmetric cushion casePartially documentedLast reviewed Not yet reviewed
Lineage← 6105-80006105-8110SPB151 →Compare with previousCompare 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.

Bezel insert

Factory

Original printed insert

Steel bezel with a printed 60-minute scale and a luminous pip. Original inserts show consistent fading and wear with the rest of the watch.

Probable

Bezel insert

Aftermarket

Aftermarket replacement insert

Replacement inserts are manufactured in quantity and are frequently fitted during restoration. Sharper printing, a whiter pip and a colour that does not match the dial's ageing are the usual signs. Common, usually disclosed, and an originality rather than authenticity finding.

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

  • Seiko 6105BFactoryDefault configurationProbable

    1970–1977

  • Seiko 6105AServiceProbable

    Whole production

    Found as a service or donor movement. Same caliber family, so the case number is satisfied; the movement then cannot be used to date the watch.

Components