Strap for Divers Sixty-Five 40 Stainless Steel / Bronze / Blue / Bracelet

The lug width of the Oris Divers 65 01 733 7707 4355-07 8 20 17 is precisely 20 mm. This measurement is critical for strap compatibility: a strap must be exactly 20 mm wide to fit correctly through the case lugs. Incorrect measurement results in either a strap too narrow (which will not seat properly) or too wide (which will rattle within the lug holes).

Three material choices offer distinct construction logics. An alligator strap with vegetable tanning pairs urban elegance with natural ageing: the leather will develop patina synchronously with the bronze oxidation, creating aesthetic coherence. A satin black box calf strap provides modern contrast and tactile clarity: black amplifies the bronzed dial's presence. A grey-black NATO strap ensures minimal maintenance, chlorine resistance, and dramatic aesthetic transformation for work weeks — this is the purely functional choice.

The procedure requires a spring bar remover tool or a small flat-blade screwdriver. Position the watch face-up, locate the elastic spring bars bridging the lugs and case. Using the tool, compress each spring bar inward: the strap will disengage. Remove the old strap. Insert the new strap by threading one end through the spring bar cavity, then compressing the bar until it seats fully within the lug hole. Apply uniform pressure to prevent case scratching.

Yes, provided the strap is precisely 20 mm wide and the internal lug space is proportionate. Artisanal aftermarket straps of superior quality — such as vegetable-tanned alligator or box calf at 1.4–1.6 mm thickness — often exceed OEM strap longevity and aesthetic presence. The critical factor is material thickness: straps exceeding 2 mm will compress the wrist unnaturally; passant rigidity must be sufficient to prevent irregular buckling during wear.

A quality leather strap — alligator, box calf, or shell cordovan — typically lasts 3–5 years with moderate daily wear, assuming proper maintenance. Longevity depends on ambient humidity, chlorine or saltwater exposure frequency, and conditioning intervals. An alligator strap with vegetable tanning requires mink oil or equivalent dressing every 6–8 months to maintain suppleness and prevent surface cracking. Vulcanised rubber straps should be replaced every 2–3 years: elasticity naturally diminishes.