Strap for Divers Sixty-Five 40 Social Club Edition / Copenhagen

The Oris Divers 65 ref. 01 733 7707 4051 OSC-CPH-Set has a lug width of exactly 20 millimetres. This measurement is fixed and does not vary between the 12 o'clock and 6 o'clock sides of the case. It is essential to verify lug width using a calliper positioned between the spring bar pins, as 20mm is a rare dimension in the contemporary market and requires purpose-built straps.

The ideal strap depends on intended use. For formal or hybrid contexts, alligator leather with a deployante buckle offers restrained elegance. For robust daily wear, vegetable-tanned calf develops natural patina over time. For marine or tropical environments, nylon NATO or vulcanised rubber ensures grip and salt-water resistance, remaining faithful to the watch's functional origins.

Obtain a spring bar tool or basic watchmaker's kit. Position the watch on a stable surface and gently insert the tool's tip into the lateral spring bar recesses. Apply light pressure to compress the internal springs; the lug will loosen on the pins and may be extracted. Align the new strap's holes with the pin ends and press until the spring bars engage. Verify that the lug is securely fastened before wearing the watch.

Any strap manufactured with a 20mm lug width is compatible. MilanoStraps offers a specific range of 20mm straps in alligator, calf, NATO, and rubber. It is critical to verify that the internal hole diameter of the strap matches the watch's spring bar pins (typically 1.8–2mm). Avoid generic "universal" straps not specifically engineered for 20mm, as imprecise tolerances compromise both aesthetics and mechanical stability.

A vegetable-tanned leather strap worn daily on a dive watch typically lasts 18–36 months before requiring replacement. Determining factors include frequency of exposure to salt water (shortens leather life), environmental humidity, and tanning quality. Vulcanised rubber, used as an alternative during summer or frequent bathing, extends the leather strap's service life by allowing it to rest. Proper maintenance—rapid drying after each immersion, occasional protective conditioning—can extend durability to 48 months.