Strap for Colt 36 Pearl Diamond / Rubber / Pin

The lug width of the Breitling Colt A7438911/A771/230S/A16S.1 is 18mm. This measurement should be taken using a digital calliper at the innermost point of the lug channel to ensure accurate compatibility with aftermarket straps.

For the steel Colt 36mm, a vegetable-tanned calf leather strap in slate grey or midnight blue offers the most coherent aesthetic match for the model's tool watch character. Matte alligator in black or mid-brown suits those seeking greater texture and depth, whilst a ballistic nylon NATO is ideal for sporting use. An 18mm steel deployant clasp is recommended for visual symmetry and secure fastening.

To replace the strap, use a fine-tipped spring bar tool to compress and release the spring bars seated within the lug holes. Gently lever between the lug and the strap, compress the spring bar, and slide the strap free. Take care to protect the steel case by applying masking tape to the lugs before starting the procedure.

Yes, any strap with an 18mm attachment width and standard spring bars is compatible. Milano Straps offers a curated selection of handcrafted straps in leather, alligator, shell cordovan and rubber, specifically made for 18mm lug widths with geometry optimised to suit the Colt 36mm lug profile.

Longevity depends on leather type and frequency of wear. A quality vegetable-tanned calf strap, with regular rotation and periodic conditioning, typically maintains structural and aesthetic integrity for 2–4 years of daily use. Shell cordovan, due to the density of its equine fibre, can last considerably longer while developing a distinctive personal patina. Frequent water exposure is the primary cause of deterioration for any leather strap.