Strap for Seamaster Diver 300M Master Co-Axial 42 No-Date Stainless Steel / Black - Orange / Rubber

The lug width is 20mm. This is the distance between the inner edges of the lugs welded to the case. To verify it, use a digital caliper positioned on the outer lugs: the value must be 20mm. A strap of different width would cause lateral gaps and accelerated wear.

High-end alligator leather is the most recommended choice, as its regular granular texture visually complements the matte black dial. For those desiring evolving patina over time, dark vegetable-tanned calf offers increasing color depth. For marine or high-humidity environments, FKM rubber ensures longevity without swelling.

Identify the thin pins connecting the strap to the case lugs. Use a spring bar tool to compress the internal spring of the pin, extracting it gently. Insert the new strap by aligning the holes with the pins, then reinsert the pins using the same tool. Verify that the strap is firmly secured and has no lateral play.

Yes, provided the lug width is exactly 20mm. Third-party straps made from alligator, calf, or rubber are fully compatible. Always verify that the new strap is securely fastened to the pins and that there are no gaps between the case sides and the strap edges.

A high-quality leather strap (alligator or shell cordovan) typically lasts 4-7 years with regular use and proper maintenance: dry it thoroughly after each water contact, avoid prolonged exposure to direct heat, and apply leather conditioner every 6-12 months. FKM rubber, instead, has a lifespan of 8-12 years without special care, resisting salt-water environments better.

The 210.32.42.20.01.006 is the anodized aluminum edition version with a Co-Axial 8806 movement on display, characterized by a lightweight aluminum bezel and a 42mm case. This specific reference was produced in limited volumes and represents a rare constructive hybrid between steel and aluminum. Other Seamaster 300M versions may feature entirely steel cases, dials of different colors, or alternative movements.