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Omega 8400

Confirmed

The no-date caliber behind the modern Seamaster 300. Its presence is a useful cross-check: a Master Chronometer no-date Seamaster should not have calendar work behind the dial, and a date window on a reference specified with an 8400 is a configuration error somewhere.

Specifications

Movement manufacturer
Omega
Production
2014–present
Frequency
25,200 vph (3.50 Hz)
Power reserve
60 hours
Winding
automatic
Complications
Centre seconds
Certification
METAS Master Chronometer

Architecture

In-house automatic with a Co-Axial escapement, twin barrels and a silicon Si14 balance spring; the no-date member of the 8500 family, certified to the METAS Master Chronometer standard.

Related calibers

  • Related caliber

    Omega 8500

    The no-date execution of the same architecture.

References using this caliber

Provenance of this record

Sources & Evidence

Primary sourceManufacturer documentation

OMEGA — Calibres and Master Chronometer certification

OMEGA SA

Accessed
2026-08-18

Cited for

This referenceConfirmed
View source ↗
Primary sourceTechnical documentation

METAS — Master Chronometer certification criteria

Swiss Federal Institute of Metrology (METAS)

Accessed
2026-08-18

Cited for

This referenceConfirmed
View source ↗

Last verified: Not yet reviewed