Strap for Colt 41 Automatic Stratus Silver / Rubber

The Breitling Colt A1731311.G820.150S has a lug width of 20mm. This measurement should be verified with a digital calliper taken at the inner distance between the two lugs at the point where they meet the case. Any 20mm strap with a straight or lightly tapered end is fully compatible with this reference.

Given the Colt's instrument-oriented character, the most suitable materials are: vegetable-tanned alligator for formal-sport use, grained calf leather for daily wear, shell cordovan for superior durability, and vulcanised rubber or ballistic nylon NATO for humid or high-activity environments. The correct width is 20mm at the case and 18mm at the buckle.

The strap is secured by standard 20mm springbars. To replace it, use a springbar tool to compress the spring-loaded ends acting on the lug slots, remove the old strap, and insert the new one by reversing the procedure. The operation takes approximately two minutes and does not require professional watchmaking tools.

Yes. All aftermarket straps with a 20mm straight end are compatible with the Breitling Colt A1731311.G820.150S. Milanostraps.it offers a curated selection of handcrafted straps produced by Casati Milano, specifically calibrated for 20mm lugs, with standard lengths of 115/75mm or customisable to suit non-standard wrist circumferences.

Longevity depends on the material and usage pattern: standard calf leather averages 12–24 months with daily wear. Shell cordovan can exceed 5 years due to its dense, grain-free structure. Vegetable-tanned alligator typically lasts 2–4 years, developing a distinctive patina over time. Prolonged water exposure significantly reduces longevity in all cases; rubber or NATO straps are recommended for aquatic or high-perspiration environments.