Breguet
Classique 5717PT/AS/9ZU— lug 18mm

The Breguet Classique 5717PT/AS/9ZU is fitted with an 18mm lug width strap. This is the standard attachment distance between the two lugs of the platinum case: to verify this on your own example, it is recommended to measure with a caliper the internal distance between the lugs in the area of contact with the strap.

For a platinum case with guilloché dial, a mississippiensis alligator strap — smooth or hornback — is the most coherent choice with Classique styling. Box-calf leather in dark shades (midnight blue, tobacco brown, matte black) is a refined alternative that develops a personal patina over time, enhanced by the contrast with the cold platinum metal.

The strap is removed using a springbar tool with a fine tip, leveraging the spring bar that secures each end of the strap to the case lug. It is recommended to work on a soft surface to protect the platinum finish, and in case of uncertainty, to rely on a watchmaker or the Casati Milano atelier for professional replacement service.

Yes. Any strap with an 18mm lug width and standard spring bars is technically compatible with the Breguet Classique 5717PT/AS/9ZU. On milanostraps.it a selection of handcrafted 18mm straps is available, designed for high-end dress watches, with profiles and thicknesses suited to the curved lugs characteristic of the Classique case.

The lifespan of a leather strap depends on the type of leather, frequency of use, and exposure to moisture and perspiration. A quality alligator strap, worn in rotation across multiple timepieces, maintains structural and aesthetic integrity for 3-5 years. Box-calf leather, being more porous, tends to develop an appreciated patina in the first years but requires more frequent replacement in case of intensive daily use. Casati Milano straps are covered by an 18-month warranty against manufacturing defects.