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Bezel insert

Speedmaster tachymeter bezel — dot over 90 ('DO90')

High confidence

Tachymeter insert on which the dot of the graduation sits above the 90 marking rather than beside it. One of a family of small, documented printing variations used to place a Speedmaster bezel in its period. The variation is genuine and well catalogued; it is nonetheless a supporting indicator, because bezels are among the most frequently swapped parts on the model.

Part reference

Brand
Omega
Material
Anodised aluminium

Documented variations

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.

  • Dot over 90

    FactoryProbable

    Whole production

    Associated with earlier production. Its value is in dating a bezel, not in authenticating a watch — a correct bezel on an incorrect watch proves nothing about the case it sits on.

Open questions

OpenComponent compatibilityMedium

Production window of the Speedmaster 'dot over 90' bezel

Over what period was the dot-over-90 tachymeter insert supplied, and did supply overlap with the later printing rather than replacing it cleanly?

Scope The variation is well catalogued and its dating is not. Because bezels are among the most frequently replaced parts on a Speedmaster, a firm window would raise this from a dating aid on a loose bezel to a usable cross-check on a complete watch.

Documented on these references

  • Omega 145.022Factory

    Whole production

    Associated with earlier 145.022 production. A dating aid for the bezel itself; bezels are frequently swapped, so it establishes little about the watch on its own.

Provenance of this record

Sources & Evidence

Secondary sourceSpecialist publication

Goldberger, John — Omega Speedmaster (Moonwatch Only)

Mondani Editore / La Sirène

Published
2014-01-01

Cited for

This referenceHigh confidence

Last verified: Not yet reviewed