Strap for Divers Sixty-Five 40 Stainless Steel / Blue / NATO

The lug width (strap width) of the Oris Divers 65 01 733 7707 4035-07 5 20 29FC is 20 mm. This measurement refers to the distance between the spring bar pins, measured from inside edge to inside edge. It is essential to verify this dimension before purchasing an aftermarket strap to ensure perfect compatibility and to avoid excessive play or mechanical conflicts with the case lugs.

The ideal strap depends on intended use: for daily elegance, shell cordovan or alligator with vegetable tanning offer natural patina and durability; for military-sport styling, a thick cotton NATO restores authentic heritage; for actual diving use, FKM rubber delivers superior grip and water resistance. The 40 mm stainless steel case pairs excellently with warm-toned straps such as cognac, tobacco, and dark burgundy.

To change the strap, you will need a spring bar tool: insert the tip into the lateral opening of the spring bar pin, compress gently to release the spring tension, then extract the pin outward. Repeat on the opposite side. When installing the new 20 mm strap, ensure that the pins click firmly into the lugs, creating a secure fit without lateral movement. Avoid forcing: the pins should click smoothly into place.

Any strap with a 20 mm lug width is compatible. Milanostraps.it offers a curated selection of artisanal straps in this size: premium leather in multiple types (shell cordovan, alligator, calf), NATO in cotton and linen, and FKM rubber. Your choice should account for maximum strap thickness (up to approximately 5 mm) to avoid compromising the visual harmony between case and wrist. All available straps have been tested for mechanical compatibility with the Divers.

Longevity depends on tanning method and usage: shell cordovan with vegetable tanning can last 5–8 years with regular maintenance (conditioning every 6–12 months); premium calf leather 3–5 years; alligator 4–7 years. Continuous sun and water exposure shortens lifespan. The natural patina that develops in the first months is a sign of quality and authenticity, not degradation. When the strap eventually wears out, you can always replace it whilst keeping the same watch: the Divers 65 is engineered for generations of straps.