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Omega Seamaster 120M

Most Omega Seamaster 120M references take a 18 mm watch strap: 23 of 30.

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Omega Seamaster 120M lug width by case size

30 references measured. Updated 2026-10-29.

CaseLug widthReferencesWatch strap attachmentFor example
35 mm20 mm1—2311.81.00
36 mm18 mm · 20 mm on 223—2101.11.00, 2101.21.00, 2101.81.00
37 mm18 mm1—2521.81.00
41 mm20 mm2—2311.11.00, 2311.21.00
42 mm20 mm2—TB 378.0885, TR 378.0885
not recorded18 mm1—120M-2511-21

References that take a different watch strap

  • 2301.11.00: 20 mm, not the 18 mm of most 36 mm cases
  • 2301.21.00: 20 mm, not the 18 mm of most 36 mm cases

Every Omega Seamaster 120M reference

Other Omega families

Inside each one the lug width often changes: it is the reference that decides.

All Omega families → · Why the size changes inside a family →