Omega
Seamaster 120M 2311.11.00— lug 20mm

The Seamaster 120M reference 2311.11.00 features a lug width of exactly 20 millimetres. This measurement can be verified with a digital calliper positioned perpendicularly to the case, between the inner points of one lug to the other, and remains consistent across all examples of this reference produced by Omega.

There is no single choice: it depends on usage. For aesthetic versatility, dark brown alligator combines elegance with the diving theme. For durability in marine environments, FKM rubber or neoprene guarantee salt resistance and rapid drying. For those ageing the watch over time, shell cordovan develops an incomparable natural patina. Vegetable-tanned alligator represents the sustainability-longevity compromise.

The strap is removed by sliding it out from the lugs using dedicated precision tools (spring bar tool). Position the watch flat, locate the through-hole on the lug, insert the tool into the internal elastic spring, decompress and extract the fastening bar. Repeat for the opposite lug. Installation of the new strap follows the reverse process: insert the strap lug ends into the holes and verify perpendicular alignment with the case.

Yes, provided the strap is sized for a 20mm lug width. Bespoke and industrial straps at this width mount without modifications to the case. Always verify that the lug thickness matches your desired visual proportions: straps that are too thin appear inadequate for a 41mm diameter, while excessively thick ones compromise the sporting elegance typical of this Seamaster.

Durability varies based on material, usage and care. Alligator and vegetable-tanned calf guarantee 4-6 years of moderate daily use before requiring replacement. Shell cordovan can exceed 7-8 years if exposed moderately to humidity. FKM rubber straps last 3-4 years in frequent marine environments. Regular maintenance—cleaning, drying and light conditioning—significantly extends operational lifespan.