Strap for Constellation Master Chronometer Small Seconds 34 Stainless Steel / Sedna Gold / Diamond / MOP

The Omega Constellation 131.28.34.20.55.001 has a lug width of 21mm. This is the distance between the spring bar pins of the case. You can verify it by measuring with a digital caliper positioned parallel to the dial, ensuring an accurate measurement to order the correct strap.

For the Constellation 131.28.34.20.55.001 we recommend straps in fine-grained alligator, net calf, or shell cordovan. Vegetable-tanned alligator develops an elegant patina that ages alongside the watch. Calf offers a more minimalist approach, while cordovan creates a warm complementarity with the Sedna Gold case.

The strap is changed using a dedicated spring bar tool to compress the spring pins. Insert the tool into the small space between the case and strap, press the pin until it clicks, then remove the old strap. Repeat on the other side. Insert the new strap by aligning the holes with the pins and release the spring.

Yes, any 21mm strap is compatible with the Constellation 131.28.34.20.55.001. Verify that the spring bars of the strap are secured correctly and that the width is exact: even 0.5mm difference can cause lateral wobbling.

A quality leather strap (alligator, calf, cordovan) lasts on average 3-5 years with daily use and proper care. Wear depends on humidity, direct sun exposure, and cleaning frequency. Rubber or fluoroelastomer straps last 2-3 years. Casati Milano offers an 18-month warranty on all custom made-to-measure straps.