Omega
Seamaster Diver 300M 2551.80.00— lug 20mm

The lug width of the 2551.80.00 model is 20mm. This measurement represents the space between the two case lugs where the strap is inserted. To verify correctly, position a ruler between the lugs without measuring the inner width of the bracelet: it must be precise to ensure a fit without lateral play but not constricting either.

For the 2551.80.00, alligator (regular texture that enhances the wave dial) and vegetable-tanned calf (classic British elegance) are ideal. Shell cordovan is the ultimate choice for those desiring deep patina over time. To preserve the aquatic soul, 100% cotton NATO Martingale or structured technical rubber maintain functional resistance and waterproofing.

Strap replacement requires removal of the spring bars that connect the strap to the lugs. Use a spring bar removal tool to compress the pins and slide them out of the lugs. Repeat the operation on both sides, then insert the new pins into the compatible 20mm strap and reattach to the case. If you are not experienced, consult a professional watchmaker to avoid damage.

Yes, provided the lug width is exactly 20mm. Any quality 20mm strap (alligator, calf, shell cordovan, NATO) is compatible with your 2551.80.00. Avoid undersized or low-quality synthetic straps: the Seamaster deserves authentic materials that age with dignity and guarantee durability.

Durability depends on the material and usage. A vegetable-tanned calf lasts 2-4 years with daily wear; alligator resists 4-6 years thanks to its natural fibrous structure and moisture resistance; shell cordovan, being extremely dense, can exceed 6-8 years. Exposure to direct sunlight, sweat, and humidity accelerate aging. A custom strap from Casati Milano, made with premium leather and excellent stitching, maintains elasticity longer than an industrial strap.