Strap for Seamaster Diver 300M Automatic 36.25 Stainless Steel / White Gold / Black / Leather

The lug width of the 2836.50.91 is 20 millimetres. Measure with a digital calliper the distance between the centre of the two lug holes to verify compatibility: even a variation of half a millimetre can cause friction and premature strap wear.

For the white gold-steel two-tone, we recommend a high-end alligator with vegetable tanning, which amplifies the sartorial dimension without competing with the case. Vintage calf and aged burgundy shell cordovan are excellent alternatives for those seeking natural patina over time.

Remove the original strap using a spring bar tool to gently push the retaining spring inward. Align the new strap holes to the lugs, insert the spring and verify that it clicks firmly in place. Do not force: the spring should enter with firm but fluid pressure.

Yes. 20mm straps are widely available online and through specialised ateliers. Always verify that the depth of the cavity on your 2836.50.91 (approximately 4-5mm) is compatible with the thickness of the strap and buckle you choose, especially if you opt for a metal deployment clasp.

A quality strap, with vegetable tanning and hand stitching, lasts an average of 3-5 years with regular daily use. Exposure to sea water and UV sun reduces durability; cordovan and alligator age better than box calf. The Casati Milano warranty covers the strap for 18 months against manufacturing defects.