Strap for Seamaster 120M Quartz 34.8 Stainless Steel - Yellow Gold / Blue / Bracelet

The Omega Seamaster 120M ref. 2311.81.00 features a lug width of 20mm. This measurement represents the internal distance between the two spring bar attachments and must be respected with precision: even minimal deviation causes strap instability and stress on the case lugs.

The Seamaster 120M 2311.81.00, given its two-tone nature (yellow gold and steel) and compact diameter (34.80mm), pairs ideally with dark tobacco alligator straps for formal wear, vegetable-tanned calf leather for historical continuity, or canvas NATO straps to enhance the sporty spirit. We advise against shiny synthetic materials that create chronological incongruity with the model's 1990s design.

Strap replacement requires extraction of the spring bar from both sides using a spring bar tool. Given the sensitivity of the two-tone case and the model's precise construction, we recommend avoiding force: if the spring bar resists, verify that the tool is correctly inserted into the release hole. The Casati Milano atelier offers this service, guaranteeing zero risk of scratching the case.

Any strap with a 20mm lug width is compatible. However, construction quality varies significantly: we recommend vegetable-tanned leather or genuine alligator, as synthetic materials or modern adhesives may stain the 904L stainless steel. Milano Straps watch bands have been tested on this model and are customizable in sizes and colors.

A premium leather strap (alligator, vegetable-tanned calf) typically lasts 5-8 years with regular use, developing a natural patina that enhances its beauty over time. Durability depends on exposure to water, sun, and humidity: the Seamaster 120M, being water-resistant, permits controlled diving, but a leather strap should be dried and treated periodically. Casati Milano guarantees 18 months on custom straps, with reconditioning available.