Strap for Colt 36 Diamond / Mariner Blue / Rubber

The lug width of the Breitling Colt A7438953.C913.230S is 18mm. This measurement is taken at the narrowest point of the internal channel between the two lugs. Any strap with an 18mm attachment width is compatible with this reference.

For the Colt 36 in stainless steel, a vegetable-tanned calf leather strap with a smooth grain is the most balanced choice: it respects the instrument-oriented sobriety of the dial and develops a natural patina over time. Shell cordovan offers greater visual structure, while vulcanised rubber is preferable for sport use or warm climates. The correct lug width is 18mm.

To replace the strap, a thin-tipped spring bar tool is required. Insert the tool into the lug hole, compress the spring bar and slide the strap free. The operation takes approximately two minutes per side. Work on a soft surface to avoid scratching the case. If in doubt, any watchmaker or the Casati Milano atelier can perform the swap at no additional charge.

Yes. Any strap with an 18mm straight-end attachment is compatible with the Breitling Colt A7438953.C913.230S. Milano Straps offers a curated selection of handcrafted leather, rubber and textile straps catalogued specifically for 18mm lugs, with keepers sized accordingly. Build quality is comparable to or exceeds that of OEM Breitling straps.

Longevity depends on leather type, frequency of wear and care. A quality vegetable-tanned calf strap worn daily retains its structural integrity for 2–4 years. Shell cordovan, owing to the density of its fibres, frequently exceeds 5 years. Prolonged exposure to water, perspiration and direct sunlight accelerates deterioration; rotating between two straps extends their lifespan considerably. Milano Straps provides an 18-month guarantee against manufacturing defects.