Strap for Seamaster Diver 300M Automatic 41 Stainless Steel / White Gold / Black / Leather

The lug width of the Seamaster Diver 300M 2830.50.91 is precisely 20 millimetres. This is the net distance between the two metal shoulders of the case where the strap lug sits. It is essential to measure this dimension correctly before purchasing a compatible strap, as even a 1 millimetre variation would make the strap incompatible.

For the Seamaster Diver 300M 2830.50.91 in steel and white gold, vegetable-tanned alligator represents the most sophisticated choice, harmonising with the patina of the gold over time. For use in aquatic environments, high-density FKM rubber offers resistance to salt and chlorine. Waxed calf leather is ideal for comfort and flexibility, while shell cordovan is perfect for durability and natural water resistance.

Strap replacement is performed by removing the springbars (small metal springs) from the case lugs using a dedicated tool. With gentle and controlled movements, extract the springbar from its seat, disconnect the old strap and insert the new one. We recommend entrusting this operation to a specialised craftsman to avoid damage to the delicate case and white gold finish.

The water resistance of the case is 300 metres, but the strap is not waterproof to the same extent. For actual diving, choose a synthetic rubber or FKM strap that does not absorb water and resists salt. A leather strap, even if vegetable-tanned, will need to dry after prolonged contact with water to prevent mould and damage.

A high-quality leather strap (alligator, calf or shell cordovan) typically lasts between 3 and 5 years of daily wear, depending on the frequency of use and exposure to weather conditions. The white gold of the case develops a patina over time that enhances a naturally aged strap. An 18-month warranty is standard for specialised craftsmen, covering manufacturing defects and initial wear from normal movement.