Omega
Seamaster 120M 2301.11.00— lug 20mm

The lug width of the Seamaster 120M (reference 2301.11.00) is 20 mm. This measurement should be taken internally between the two vertical supports of the case where the spring bar is located. It is important not to confuse lug width with strap width: the 2301.11.00 requires straps specifically constructed for 20 mm width.

For the Seamaster 120M 2301.11.00 in yellow gold and steel, we recommend vegetable-tanned alligator, which develops an extraordinary natural patina over time and harmoniously complements the two-tone combination. Alternatively, shell cordovan offers singular material density with accelerated patination capability, while box calf ensures daily versatility and certified durability.

To change the strap, you need to use a spring bar tool or remover to compress the spring bar located inside the lug. Once the spring is compressed, the old strap comes out easily. Insert the new 20mm strap by aligning the upper and lower lugs, then snap the spring bar back into place. If you lack experience, consult a specialized watchmaker.

Yes, the Seamaster 120M 2301.11.00 is fully compatible with quality aftermarket straps in 20 mm size. On milanostraps.it you will find a curated selection of artisanal straps in alligator, calf, shell cordovan and rubber, all tested for compatibility with your watch and customizable in size, initials and stitching color.

The lifespan of a leather strap depends on the material and use. An alligator or calf strap in vegetable tanning, worn daily on a Seamaster 120M, has an average life of 5-8 years before requiring replacement. Shell cordovan, thanks to its superior density, can exceed 10 years. Rubber straps last 3-5 years. The Casati Milano guarantee on custom straps is 18 months, extendable for scheduled maintenance.