Strap for Colt 41 Automatic Mariner Blue / Calf

The lug width of the Breitling Colt A1731311.C934.113X is 20mm. This measurement refers to the internal distance between the two lugs of the case and is the key parameter for selecting a compatible aftermarket strap. It should be measured using a calliper positioned at the strap attachment point, not across the bezel.

The ideal strap for the Breitling Colt A1731311.C934.113X depends on the intended use. For professional or sporting contexts, a ballistic nylon NATO or a vulcanised rubber strap reinforces the watch's aeronautical heritage. For everyday refined wear, a vegetable-tanned alligator or shell cordovan strap in tobacco or navy tones provides artisanal quality that complements the stainless steel case.

To replace the strap on the Breitling Colt A1731311.C934.113X, use a fine-tipped spring bar tool. Insert the tip into the lug's lateral slot, compress the spring bar and slide the strap outward. Take care not to scratch the steel surfaces—it is advisable to protect the lugs with masking tape during the operation.

Yes, any strap with a 20mm attachment width is compatible with the Breitling Colt A1731311.C934.113X, provided the overall length and end profile suit the case geometry. Milano Straps offers a curated range of handcrafted 20mm straps in leather, rubber and nylon, each verified for fitment and finish on this specific Breitling reference.

The lifespan of a leather strap depends on the material and frequency of use. A vegetable-tanned leather strap, kept away from excessive perspiration and water, can last between three and five years with daily wear. Shell cordovan, owing to its dense fibre structure, tends to last longer while developing a distinctive patina. Alligator straps benefit from occasional treatment with neutral wax to preserve the grain texture.