Strap for Classic Date 37 Stainless Steel / Silver / Bracelet

The lug width is 18 millimetres. This measurement is taken perpendicular to the dial between the inner edges of the lugs. To verify on your watch, use a digital calliper or rigid ruler placed across the lug seats: the result should read 18.0mm. This size is standard across many 36–37mm wrist watches, offering considerable choice in replacement straps.

For the Classic Oris, straps in vegetable-tanned leather—calf, alligator, or shell cordovan—are ideal, as they enhance the sober satiné steel case and develop natural patina over time. For sports versatility, NATO straps in high-density polyamide ensure durability and tool-free changes. For aquatic daily wear, satiné black rubber maintains elegance whilst protecting against moisture. Recommended thickness: 4–4.5mm to avoid undue stress on the lugs.

The strap is replaced via spring bars (lug pins) that slide into the case lugs. Required tools: dedicated spring bar removal tool (watchmaker's lever) or thin metal shim. Procedure: place the watch face-down on a soft surface, insert the lever under the lateral pin, press gently and lift the strap; repeat on the opposite side. Align the new strap holes with the lugs and secure the spring bars. Avoid forcing to prevent damage to the lug seats.

Yes, an aftermarket 18mm strap is fully compatible with the Oris Classic 01 733 7578 4051-07 8 18 61, provided it meets quality standards (satiné steel, properly tanned leather or polyamide). Verify that thickness does not exceed 5mm and that spring bar holes are correctly aligned. Artisanal Italian leather straps constructed with vegetable tanning offer superior durability and patina compared to industrial production, whilst maintaining elegant proportions on the lug.

Leather strap lifespan depends on tanning method, thickness and wear frequency. Vegetable-tanned leather—such as calf or alligator—ranges from 3 to 8 years with daily wear. Factors accelerating deterioration: prolonged sun exposure, constant moisture, acidic perspiration, spring bar pressure. To maximise longevity: dry the watch after water contact, allow the strap to air every 2–3 days, avoid direct dry heat. Replacement is recommended every 3–4 years with intensive use; 5–7 years with moderate wear.