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

The lug width is 20mm. This width is specific to the caliber 8806 and the proportions of the 42mm case. To verify it, measure the internal space between the case lugs with a digital caliper. It is essential to respect this measurement to avoid mechanical play or incompatibility.

It depends on usage: vegetable-tanned alligator offers hybrid elegance, ideal for the office and weekends. For frequent diving use, an FKM rubber or medical-grade silicone strap is waterproof and slip-resistant. A calf with natural patina develops character over time, while a ballistic nylon NATO guarantees versatility and quick changes.

The strap is attached to the case via two metal spring bars. Use a specific tool to release the internal spring of the bar, lifting the old strap from the lugs. Insert the new strap by aligning the holes with the spring bars, then snap it back into place. Avoid forcing to prevent scratching the case; if inexperienced, consult a professional watchmaker.

Yes, any strap with a 20mm lug width is compatible. Always verify that the strap is exactly 20mm, not approximations. Artisanal leather straps, technical rubber, or superior-quality fabric do not damage the case and offer aesthetic freedom compared to the original bracelet.

A quality leather strap (alligator, calf, shell cordovan) lasts 3–5 years with regular use and proper maintenance. Prolonged exposure to salt water reduces durability. An FKM rubber strap resists 5–10 years if washed regularly with fresh water. Casati Milano offers an 18-month warranty on artisanal straps and recommends annual inspection for early replacement if necessary.