Strap for Constellation Master Chronometer Small Seconds 34 Stainless Steel / Silver

The Omega Constellation reference 131.13.34.20.02.001 is equipped with 21mm lugs. This measurement is standard for Constellation models with a 34mm diameter and ensures compatibility with all straps in the 21mm collection. To verify your lug width, measure the internal distance between the case terminals—that is the actual width your strap must respect.

For a 34mm steel Constellation, we recommend straps in vegetable-tanned calf or alligator leather, which enhance the watch's classic elegance without visually overloading it. In summer, a NATO or rubber strap with an executive keeper maintains freshness. What matters is choosing leather with compact thickness (1.2-1.4mm) to respect the delicate proportions of the case. On milanostraps.it you will find all 21mm options already tested and selected.

The Constellation 131.13.34.20.02.001 uses standard 21mm spring bar lugs. To change them, get a spring bar tool or contact a watchmaker. Insert the tool tip into the spring bar groove to compress it, pull the strap outward, and replace it with a new one. The procedure takes just a few minutes. If you prefer to avoid it, Casati Milano offers installation service by appointment.

Yes, if the strap is certified 21mm, it will be compatible. Lug width is the fundamental parameter and the 131.13.34.20.02.001 requires exactly 21mm. Also verify the strap height (usually 18-20mm) to ensure it does not protrude excessively from the case lugs. The artisanal straps from milanostraps.it are made with these parameters already considered.

A quality leather strap, worn daily, lasts 2-4 years before requiring replacement. Longevity depends on the leather chosen (vegetable-tanned calf is more durable than alligator), frequency of use, humidity, and sun exposure. Rubber lasts longer (4-6 years), fabric NATO even longer. The artisanal straps from Casati Milano come with an 18-month warranty and can be renewed through a new keeper or restitching.