Oris
Divers 65 01 733 7771 4085-Set— lug 19mm

The lug width is 19 millimetres. This technical parameter defines strap compatibility: it allows you to fit an appropriate strap without requiring thickness reduction or intervention on lugs and pins. To measure correctly, position the watch with dial facing down and use a digital calliper to measure the distance between the inner wall of one lug and the inner wall of the opposite lug.

The choice depends on the balance between aesthetics and usage. An alligator strap in dark brown by Hermès or Loxley amplifies structural legibility by creating contrast with satin-finished steel lugs. A calf with vegetable tanning personalises patina development over time. For pure functionality, a high-density polyamide NATO or a rubber strap guarantees prolonged comfort in aquatic environments without maintenance. For formal settings, a steel deployante makes NATO elegant even in business attire.

Strap replacement requires: a spring bar removal tool, or alternatively a small flat file; an illuminated, anti-static work surface (cotton mat); patience. Position the watch at 3 o'clock with the lug facing you. Insert the tool tip into the groove of the spring holding the pin at the lug base and press gently upward until the pin retracts. Remove the pin and take off the old strap. Insert the new strap into the pin, align the ends with the lug grooves, and reinsert the pin. Verify that the pin is fully engaged before wearing the watch.

Yes, any strap with 19mm lug width is compatible, regardless of brand or material, provided it is designed for standard pins. Milano Straps manufactures handcrafted 19mm straps in alligator, vegetable-tanned calf, shell cordovan, NATO and rubber, all ready for use with Oris lugs. Always verify that the strap thickness—typically 4–5 millimetres at the base—permits comfortable coupling to the lugs without excessive play.

A high-quality leather strap—Hermès alligator, vegetable-tanned calf, or shell cordovan—with regular maintenance lasts an average of 5–8 years before replacement is needed. Durability depends on frequency of wear, moisture exposure (the Divers resists 300 metres, but the strap does not), seasonal maintenance, and tanning type. Vegetable tanning ages naturally, acquiring patina; chrome tanning is more stable but less characteristic. NATO and rubber straps last 3–5 years before losing elasticity or showing UV degradation, but are more economical and easier to replace.