Strap for Seamaster Diver 300M Automatic 41 Titanium / Black / Bracelet

The Seamaster Diver 300M Ref. 2231.50.00 features a 20mm lug width. This measurement is specific to the model and is proportioned to the 41mm case diameter. To verify compatibility, measure the internal space between the case horns: a distance of 20mm confirms the correct lug width.

The choice depends on intended use and desired aesthetics. For formal elegance, we recommend natural alligator or vegetable-tanned calf leather in brown or black tones. For sports versatility, a NATO strap in nylon or canvas offers practicality and alignment with the watch's instrumental DNA. FKM rubber remains the most authentic choice for underwater situations or humid environments.

The strap is replaced using a spring bar tool to push the pins that secure the strap to the case lugs. Insert the tool into the small hole on the upper part of the pin, gently push until the pin retracts, and slide the strap outward. Reverse the procedure to install the new 20mm strap. If you prefer to avoid the risk of damage, the Casati Milano atelier offers a strap change service with warranty.

Yes, provided they respect the exact 20mm lug width. Aftermarket straps in alligator, calf, or rubber of equivalent quality are fully compatible. MilanoStraps offers a specialized collection of 20mm straps certified for this configuration, with customization options and an 18-month warranty through the Casati Milano atelier.

Durability depends on material and usage. A quality alligator strap, subjected to moderate use and proper maintenance (regular cleaning, protection from excessive moisture), can last 5-7 years or more. Vegetable-tanned calf tends to be less durable (3-5 years) but develops a more distinctive patina. MilanoStraps warrants its straps for 18 months and provides guidance on maintenance and preventive replacement.