Strap for Premier Automatic Day & Date 40 Stainless Steel / Black / Nubuck Black / Folding

The Breitling Premier A45340241B1X2 has a lug width of 20mm. This measurement should be taken with a digital calliper at the inner point between the two lugs, where the strap sits. 20mm is one of the most common lug widths in fine watchmaking, ensuring a wide availability of quality aftermarket straps.

For the Premier A45340241B1X2 with its 40mm stainless steel case, a glossy alligator strap in tobacco or midnight blue tones pairs well with the brushed case finishing. Vegetable-tanned calf leather in cognac or dark brown develops a personal patina over time. For a sport-elegant combination, shell cordovan offers superior compactness and longevity. A brushed steel deployant clasp adds material continuity between case and strap.

Strap replacement on the Premier A45340241B1X2 is carried out by removing the spring bars located in the lugs. Using a spring bar tool, compress each bar inwards until it releases from the lug hole. Place the watch face-down on a soft cloth to avoid scratching the case. The new 20mm strap is fitted by repositioning the spring bars into the corresponding slots on both strap ends.

Any strap with a 20mm lug width is technically compatible with the Breitling Premier A45340241B1X2. Milanostraps.it offers a curated selection of handcrafted straps in leather, alligator, cordovan, NATO and rubber specifically tailored for this size, with bespoke customisation available through the Casati Milano atelier. It is advisable to verify that the buckle or deployant clasp is sized appropriately — typically 18mm taper or 20mm straight — depending on the strap configuration.

The lifespan of a leather strap depends on leather quality, daily use and care. A quality vegetable-tanned calf strap typically lasts 2–4 years with daily wear. Shell cordovan, owing to its dense fibre structure, can exceed 5–8 years. Alligator, when treated periodically with neutral wax and kept away from prolonged water exposure, retains its structure and sheen for 3–6 years. Casati Milano backs all its straps with an 18-month manufacturing defect warranty.