Strap for Divers Sixty-Five 42 Stainless Steel / Black / Rubber

The Oris Divers 65 in the ref. 01 733 7720 4054-07 4 21 18 version features a precisely measured lug width of 21mm. This dimension is determined by the proportion between the case diameter (42mm) and the depth of the lateral lugs. To verify aftermarket strap compatibility, position a ruler perpendicular to the watch plane, measuring from the inside of one lug to the inside of the other: the value must correspond to 21mm without tolerances.

The choice depends on intended use. For formal-smart daily wear, we recommend leather with vegetable tanning (dark brown or matte black), which develops natural patina over time. For diving and marine environments, vulcanised rubber with stainless steel deployante ensures resistance to salt corrosion. Military canvas NATO represents the versatile solution for alternation with leather, visually transforming the model from submarine instrument to expedition tool.

Remove the watch from your wrist. Locate the spring bars (small horizontal metal pins securing the strap to the lugs). Using a spring bar tool or small flat screwdriver, apply pressure towards the watch centre on one spring bar to release one strap end. Repeat on the other side. Replace the old strap by inserting the spring bars into the holes of the new strap lugs, ensuring they are perfectly seated. Verify that the strap is centred and does not appear inclined relative to the case.

All straps with 21mm lug width are compatible. Milanostraps.it offers a specialised collection of leather straps (calf, alligator, shell cordovan), military canvas NATO, and vulcanised rubber, all certified for 21mm lug width. Always verify that the strap features compatible spring bars (standard 1.8mm diameter). Avoid 20mm or 22mm straps to prevent lug failure during replacement.

Longevity depends on material and usage frequency. A chrome-tanned calf strap, with moderate daily wear, guarantees 3-4 years of comfortable use. Vegetable-tanned leather, developing natural protective patina, can last 5-7 years if protected from prolonged water and rain exposure. Shell cordovan, thanks to fibre density, reaches even 8-10 years. Military canvas NATO easily exceeds 10 years. Vulcanised rubber, with ordinary maintenance, maintains functionality beyond 5 years. Periodic maintenance (cleaning, protection, rotation with other straps) significantly extends lifespan.