Strap for Seamaster Diver 300M Automatic 41.5 Chronograph Yellow Gold / Diamond / Sapphire / Blue / Bracelet

The lug width is 20 mm. This is the distance between the two lugs of the case, measured from the inner wall. A 20 mm strap ensures perfect fit without mechanical play or stress on the yellow gold.

Havana-colored alligator or natural shell cordovan offer the best aesthetic balance with yellow gold. Alligator maintains unalterable elegance; cordovan develops an amber patina over time, creating chromatic resonance with the metal. Vegetable-tanned calf is the accessible compromise with soft grain and honey colorations.

Extract the lugs from the case using a spring bar tool: insert the bifid tip into the lateral slots, compress the internal spring slightly, and slide the lug outward. Once freed, you can remove the old strap and insert the new one (20 mm) aligning it to the seat. Reinsert the lugs ensuring they lock with a click.

Yes, provided it is certified 20 mm and of construction quality equal to the watch's value. Avoid generic or undersized straps: yellow gold is soft and the lugs could deform under incorrect pressure. We recommend specialized brands and straps crafted by hand in leather or canvas.

A high-quality leather strap (alligator, shell cordovan, vegetable-tanned cowhide) has an average lifespan of 3-5 years with daily use and proper maintenance. Salt water exposure and water (frequent on a diver) reduce durability: we recommend quick drying after swimming and rotation with replacement straps to extend useful life.