Strap for Constellation Quartz 25.5 Stainless Steel / Diamond / MOP / 160 Years

The lug width of the Omega Constellation 111.15.26.60.55.001 is exactly 20 millimetres. This measurement is the fundamental parameter for purchasing any compatible strap. You can verify it by measuring the distance between the two strap attachments (lugs) on the case, from inner point to inner point. A 20mm strap will fit perfectly without lateral protrusion, preserving the elegant proportions of the 25.50mm case.

For the Constellation 111.15.26.60.55.001, three profiles are recommended: alligator for formal occasions (the straight grain imparts intrinsic elegance), vegetable-tanned calf for elegant daily wear (ages with fascinating patina), and heavy cotton NATO for versatility. The choice depends on wearing context and dial colour. A black or dark brown alligator strap on a silver dial creates maximum formal contrast, while a naturally aged calf strap offers more refined, less rigid sophistication.

To change the strap, obtain a spring bar tool or consult a watchmaker. Position the watch with the lug opposite to the one you're working on facing towards you. Insert the tool tip into the small slot under the lug to release the elastic pin (spring bar), then slide out the old strap. Repeat for the other lug. Install the new strap by aligning the holes with the lugs and pushing until the pin clicks into position. Do not force: the mechanism should insert with a clean click.

Yes, numerous certified aftermarket options exist for the 20mm lug width. On MilanoStraps you will find straps in alligator, calf, shell cordovan and technical materials, all customisable for length, colour, initials and stitch type. Quality assurance is essential: choose manufacturers who control tanning, verify stitch integrity and offer guaranteed returns. Casati Milano also creates custom pieces, with personalised consultation and WhatsApp updates.

A quality leather strap (alligator, calf, shell cordovan) typically lasts 3–5 years of regular wear, depending on frequency of use and care. Alligator tends to last longer due to skin structure. Vegetable-tanned leather ages magnificently but requires more maintenance. To extend lifespan: avoid prolonged exposure to direct sunlight and humidity, clean with a soft cloth, condition every 12 months with a specific leather product. MilanoStraps offers straps with an 18-month guarantee, and Casati Milano provides stitch replacement if needed.