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

The lug width of the Oris Divers 65 ref. 01 733 7707 4055-07 5 20 45 is 20 millimetres. This specification refers to the distance between the inner shoulders of the lugs where the strap attaches. Measuring the lug width correctly is essential for ensuring aftermarket strap compatibility: a strap with a different width (18mm or 22mm) will not mount physically on the watch's spring bars.

The best strap depends on intended use and personal aesthetic preferences. For a formal, elegant look, we recommend a black or dark brown alligator strap with vegetable tanning or professional dyeing. For professional or diving environments, a NATO strap in cotton/nylon blue or military green maintains historical authenticity. A vulcanised rubber strap is the most technical and contemporary choice. A stainless steel satin-finished deployant clasp remains the ideal fastening system to preserve the watch's proportional architecture.

To change the strap on an Oris Divers 65, you must remove the spring bars that pass through the watch case lugs. Obtain a dedicated spring bar tool and extract the bars gently, avoiding scratches on the case. Remove the old strap by loosening the bars from their seats. Insert the new strap (compatible with 20mm lug width) into the lateral supports of the case, align the holes, and reintroduce the bars. Verify that the strap is securely fastened before wearing the watch.

Yes, numerous aftermarket straps are compatible with 20mm lug width. Compatibility is guaranteed by the correct strap width: any strap with 20mm lug width will mount correctly on the watch's spring bars. On milanostraps.it, you will find a specialised selection of 20mm straps in leather (alligator, calf, shell cordovan), NATO fabric and rubber, customisable according to your colour and construction preferences.

The lifespan of a leather strap depends on construction quality, type of tanning, and intensity of use. A high-quality alligator strap with vegetable tanning or professional dyeing can last 2–4 years of daily wear before requiring replacement. A thinner calf strap will have a slightly shorter lifespan (18–36 months). Durability increases if the strap receives regular maintenance: avoid prolonged water immersion, dry the leather after moisture exposure, and occasionally apply a specific balm to maintain fibre elasticity.