Omega Seamaster 120M 2101.21.00

The Omega Seamaster 120M 2101.21.00 takes an 18 mm watch band.

Omega · Seamaster 120M

18mm

lug width

Shop 18 mm bands

Every watch that takes 18 mm →

Lug width: 18 mm
Case diameter: 36 mm
Reference: 2101.21.00
Family: Seamaster 120M
Case material: Oro giallo
Model: Seamaster 120M Automatic 36.25 Yellow Gold / White
Year: 1993

Bands that fit

Cut and stitched in Milano, in the width this watch takes.

Hammered Black Calfskin Strap — Ecru Stitching€98

Brown Italian Leather Strap€80

Black Saffiano Strap Ecru Stitching€90

Vintage Brown Calfskin Strap — Natural Patina€98

Swift Topo Leather Strap€120

Green Lizard Strap€145

See every 18 mm band →

Will a strap close on your wrist?

Set for this watch: 36 mm of case and 18 mm between the lugs. Add your wrist and see where a standard strap would close.

Your wrist

Watch length, lug to lug

Filled in with the case diameter, which is what we hold for this reference. Measure the watch tip to tip for the exact answer: it is usually a few mm more.

Enter your wrist measurement to see whether a standard 75/115 mm strap closes on you, and where.

Why ready-made straps come in one length →

Sizing notes

18 mm is the gap between the lugs, so a 18 mm band goes in without adapters. Whether it sits flush against a 36 mm case depends on how that case is shaped.
Inside the Seamaster 120M family the lug width is not one number: it runs 18, 20 mm. This reference is the 18 mm one, so a band bought for another Seamaster 120M may not fit it. Why the size changes inside a family →
18 mm is not a common size: only 3,965 of the 41,485 watches measured take it (9.6%), so ready-made choice at this width is narrower than at 20 or 22 mm. Every watch that takes 18 mm →