Strap for Seamaster Diver 300M Co-Axial 44 Chronograph Titanium / Grey / Rubber / ETNZ

The lug width is 20mm. This is the internal distance between the two lugs of the case, measured horizontally. Verify compatibility by removing the deployant from the original bracelet and measuring with a caliper: the value must be 20mm ± 0.1mm. All 20mm straps are compatible with this model.

For grade 2 titanium, we recommend alligator dyed in marine tones (dark blue, sage green, black) for sophisticated aesthetic contrast. Alternatively, calf leather with vegetable tanning develops natural patina over time; FKM rubber remains the most practical choice for diving and aggressive marine environments. Avoid vivid colors and excessive grain: the Seamaster possesses intrinsic sobriety.

The integrated bracelet of the 212.92.44.50.99.001 is fixed to the case. To wear an aftermarket strap, remove the original deployant (the folding clasp) and insert the spring bars of the new strap directly into the case lugs. No special tools required: operate with care to avoid scratching the titanium case. If you are not experienced, consult a watchmaker.

Yes. Any strap with a 20mm lug width is compatible. Milano Straps offers straps in alligator, calf leather and FKM rubber, customizable in sizes, initials and stitching thread. The atelier Casati Milano also offers bespoke custom straps with personal choice of leather and 18-month warranty.

On a Seamaster Diver 300M, durability depends on usage. With frequent exposure to salt water, humidity and UV rays, a quality leather strap (alligator or calf with vegetable tanning) lasts 3-5 years with regular maintenance. For aggressive marine environments, FKM rubber is more durable (7+ years). Milano Straps guarantees 18 months on bespoke straps crafted by Casati Milano.