Strap for Colt 41 Automatic Mariner Blue / Rubber

The lug width of the Breitling Colt A1731311.C934.148S is 20mm. This measurement refers to the internal distance between the two lugs of the case and defines the exact strap width required. Fitting a strap of a different width would result in an incorrect mount and an unsatisfactory aesthetic finish.

The ideal choice depends on the intended use. For formal or business settings, a vegetable-tanned alligator strap complements the steel case finishes beautifully. For everyday wear, smooth calfskin offers the best balance of durability and comfort. For sporting or outdoor use — consistent with the Colt's original DNA — a nylon NATO or vulcanised rubber strap is the most coherent option.

To replace the strap on the Breitling Colt A1731311.C934.148S, you will need a dedicated springbar tool. Insert the tool between the lug and the springbar, compress the spring, and slide the strap free. Care should be taken to avoid scratching the case. If in doubt, it is advisable to entrust the operation to a professional watchmaker or to the Casati Milano atelier.

Yes, any aftermarket strap with a 20mm lug width is compatible with the Breitling Colt A1731311.C934.148S. Milano Straps offers a curated selection of handcrafted straps in various leathers and materials, all produced with a 20mm attachment width and fitted with high-quality buckles or deployant clasps.

The lifespan of a leather strap depends on material quality, frequency of use, and daily care. A premium alligator or calfskin strap, conditioned regularly and kept away from excessive moisture, can last between three and six years while retaining a presentable appearance. Vegetable-tanned leathers develop a characteristic patina over time, whereas chrome-tanned leathers tend to deteriorate more quickly.