Strap for Top Time B31 Stainless Steel / Silver

The Breitling Top Time AB3113281A1X1 features a 38mm stainless steel case with a lug width of 20mm. This measurement must be taken with a calliper at the inner gap between the two lugs, precisely where the strap sits. This is a fixed specification: only a 20mm strap ensures a correct, play-free fit.

For a vintage-inspired chronograph such as the Top Time, a vegetable-tanned alligator strap with contrast stitching is the most coherent aesthetic choice: it complements the classic character of the dial without overwhelming the case's proportions. Box calf leather offers a more understated alternative. For sport or summer use, a nylon NATO or a high-density rubber strap provides comfort and moisture resistance.

The strap is removed using a springbar tool, a double-ended instrument designed to compress the spring bars housed within the lugs. Care should be taken to protect the case surface with a soft cloth to avoid scratching. The same process in reverse allows fitting of a new 20mm strap. If in doubt, the operation can be entrusted to a watchmaker or to the Casati Milano atelier.

Yes, the aftermarket offers a wide range of compatible options in 20mm. Italian artisan production, such as that of Casati Milano, allows for bespoke straps in selected materials—alligator, calf, shell cordovan—with custom finishes including stitching, colour, keeper and buckle. Compatibility is ensured by the standard 20mm lug width, which is independent of the original Breitling spring bars.

The lifespan of a leather strap depends on the material, care and frequency of wear. A quality vegetable-tanned alligator strap, conditioned with leather cream every three to six months and kept away from excessive moisture, can last between three and seven years while retaining its structural integrity. Calf leather has a slightly shorter lifespan but generally exceeds two years with routine care. Casati Milano warrants its straps for 18 months against manufacturing defects.