Strap for Seamaster Diver 300M Automatic 41 Stainless Steel / Electric Blue / Bracelet

The lug width of the Seamaster Diver 300M 2055.80.00 is precisely 20 millimetres. This width is specific to this model and maintains the correct proportions between the 41mm case and the strap. Measure correctly by inserting a digital calliper between the lateral attachment pins of the case.

It depends on the intended use. For daily urban wear: vegetable-tanned calf in cognac or black tones, which supports the wrist with construction density worthy of the case. For diving and marine environments: FKM rubber or elastomer, which guarantees exceptional grip on wet skin. For formal elegance: alligator with pronounced grain in sage green or brown, paired with a stainless steel deployant clasp.

The procedure is straightforward: Use a spring bar remover (a small lever tool with two notches) to lift the elastic pin that secures the strap to the case. Insert the lever into the lateral slot, press gently inward to release the pin, then remove the old strap. Insert the new strap by aligning the holes with the case pins and press until the safety click engages.

Yes, numerous 20mm compatible straps are available online, ready for shipment. Milanostraps.it offers a specialised collection of 20mm straps customisable in sizes, initials, and thread colour. For an artisanal experience, the Casati Milano atelier crafts custom straps with personal choice of leathers and an 18-month warranty.

Durability depends on the material and environmental exposure. A vegetable-tanned calf strap, with regular maintenance (application of neutral balm every 6 months), lasts 3–5 years in daily urban use. If frequently exposed to saltwater, the lifespan reduces to 18–24 months. FKM rubber straps have superior technical life (7–10 years) as they resist moisture, but deteriorate under prolonged UV exposure.