Strap for Seamaster Diver 300M Master Co-Axial 44 Chronograph Titanium / Tantalum / Sedna Gold / Blue / Bracelet

The lug width is 21mm. This measurement is specific to the 44mm diameter model and is essential for compatibility. Verify by measuring with a ruler between the inner lugs of the case: a 1mm discrepancy will make the strap unwearable.

Virgin alligator (variegated natural grain) creates striking aesthetic contrast against the satin steel. Vegetable-tanned calf develops a cognac patina over time, synchronizing with the watch. For intensive marine use, FKM rubber offers tactile comfort and durability. Generic synthetic NATO straps are not recommended; the Seamaster deserves material substance.

Use a spring bar tool (removable pin) to release the pins from the lug seats. Extract the pin completely, remove the old strap and insert the new one by aligning the circular hole with the pin. Reinsert the pin until the locking click. Repeat the operation on the second side. If the pins are secured by screws (rare on this model), consult a specialized watchmaker.

Yes, provided it respects the 21mm lug width and is compatible with the Seamaster's pin thickness. Custom artisanal straps from milanostraps.it are made specifically for this compatibility. Always verify dimensions before ordering: the lug width must fit into the lugs with precision and no lateral play.

A quality strap (alligator, vegetable-tanned calf, shell cordovan) with oleophobic-hydrophobic protection lasts 3–5 years with daily use. Frequent exposure to seawater accelerates degradation of untreated leather. Artisanal straps from Casati Milano include an 18-month warranty; to extend lifespan, it is advisable to avoid frequent immersions and to dry promptly after contact with saltwater.