Strap for Tourbillon Five Days Yellow Gold / Silver

The Breguet Classique Complications 5317BA/12/9V6 is fitted with an 18 mm lug width. This measurement is taken with a digital caliper positioned between the two lugs of the case, at the narrowest point of the attachment channel. It is important not to confuse this measurement with the buckle loop width, which may be slightly smaller (typically 16 mm) on tapered straps.

For an 18-carat yellow gold case with guilloché dial, the most suitable strap is mississippiensis alligator with fine grain and matte finish, in deep bordeaux, midnight blue, or tobacco brown tones. Hornback crocodile is an alternative with greater surface texture. Premium box calf grain is recommended for intensive daily wear, thanks to its ability to develop a characteristic patina over time.

Strap replacement requires a dedicated springbar tool or lever—a fork-shaped instrument that allows compression of the spring pins (springbar) housed in the case lugs. It is advisable to work on a soft surface to avoid scratching the yellow gold case and to use 18 mm steel springbars with reinforced ends, suitable for the weight of the tourbillon movement. If uncertain, the operation can be performed at the Casati Milano atelier.

Yes, there are artisanal aftermarket straps fully compatible with the 18 mm lug width of the Breguet 5317BA/12/9V6. Compatibility depends on three factors: the attachment width (18 mm), the curvature of the strap end which must adapt to the domed case profile, and the quality of the springbars used. On milanostraps.it, selected 18 mm straps compatible with this reference are available, made from premium leathers with artisanal finishes.

The lifespan of a leather strap depends on the material, daily use, and dedicated care. A quality alligator strap, periodically treated with specific nourishing cream and alternated with other straps, can last three to five years while maintaining an impeccable appearance. Calf tends to develop a patina more quickly and show signs of wear around 18-24 months of daily use. Casati Milano offers an 18-month warranty on manufacturing defects for all straps made in the atelier.