Strap for Seamaster 300 Master Co-Axial Stainless Steel / Black / Bracelet / 60th Anniversary / Trilogy Box

The lug width is 19mm. This dimension requires straps specifically built for this calibre. Always verify by measuring the distance between the lug pins of your case with a digital calliper to avoid attachment defects.

For the brushed Seamaster 300 with Shades of Blue bezel, we recommend fine-grained alligator (matching the brushed finish), aniline calf leather in blue or anthracite tones, or FKM sport rubber for water use. Avoid glossy straps that contrast with the matte case finish.

Remove the lug pins using a spring bar tool. Position the watch on a stable surface, gently compress the small recess under the pin and extract horizontally. Insert the new strap by first aligning one pin shoulder, then press until it clicks. Proceed carefully to avoid scratching the case.

Yes, provided the strap is specifically built for <a href="https://milanostraps.it/collections/cinturini-orologi-per-misura-ansa-19mm">19mm lug width</a>. Verify that the anchor width on the pins is precise (± 0.2mm) and that the strap does not rub against the case sides during wear. Artisanal milanostraps.it straps guarantee this compatibility.

A premium leather strap (alligator, calf, shell cordovan) lasts 3-5 years with daily use and proper maintenance. Durability depends on frequency of use, sun exposure, body humidity and climatic conditions. Sport straps in FKM rubber or NATO fabric have superior resistance (5-8 years) in extreme conditions. Casati Milano offers 18-month warranty and regeneration services for aged leather.