Strap for Seamaster Diver 300M Nekton Edition / Rubber

The lug width of the Seamaster Diver 300M 210.32.42.20.01.002 is 20mm, which is the distance between the inner horizontal pins of the lugs. This dimension is standard for all Seamaster Diver 300M models with a 42mm case. It is advisable to manually verify by measuring the internal distance between the pins before ordering an aftermarket strap.

Dark blue alligator or chocolate brown represents the most suitable pairing with the modern case geometry and ceramic bezel. If you seek more pronounced texture, vegetable-tanned structured calf creates elegant contrast. For frequent water use, waxed canvas NATO or FKM rubber offer superior practicality, though less formal in aesthetic appeal.

The strap is changed by extracting the two horizontal pins that pass through the lugs. Using a watchmaker's spring bar tool (a small non-invasive instrument), push the pins from inside outward, freeing the strap. The procedure requires delicacy to avoid scratching the brushed steel. If unsure, the Casati Milano atelier performs the change by appointment with utmost care.

Yes, any strap with a 20mm lug width is compatible with the 210.32.42.20.01.002. However, we recommend verifying that the strap thickness is not excessive (no more than 4.5mm at the passant points) to avoid bulk when the strap is inserted between the lugs. Milan Straps handcrafted straps are specifically dimensioned for this geometry.

The lifespan of a leather strap depends on material quality, frequency of wear, and exposure to moisture and heat. A high-quality alligator or calf strap worn daily typically lasts 3-5 years before showing significant fiber wear. With proper care (drying after water contact, avoiding excessive bending), the lifespan can be extended. Casati Milano offers an 18-month warranty and restoration services for worn straps.