Strap for Horological Machine HMX Black Badger Purple

The lug width of the MB&F Horological Machines 57.STPL.B is 20 mm. This measurement is determined by the structural geometry of the case and represents the distance between the two horizontal attachment points where the strap is fixed. It is essential to verify this dimension before ordering an aftermarket strap to ensure complete compatibility.

The best strap depends on intended use and personal preference. Black or brown alligator with vegetable tanning offers formal elegance; vegetable-tanned calfskin ensures daily comfort and develops a captivating patina over time; FKM black rubber combines resistance and contemporary design. Technical nylon NATO straps emphasise the engineering aesthetic. For the 57.STPL.B, we recommend materials with moderate texture that do not compete with the sculptural case.

Changing the strap requires a precision tool (spring bar tool). Gently remove the spring bars from the attachment holes, taking care not to scratch the titanium and stainless steel case. Position the new bar in the cavities, ensuring the strap is aligned perpendicularly. If you prefer to avoid the risk, contact our Atelier Casati Milano for strap changes and bespoke personalisation.

Yes, all straps with a 20 mm lug width are compatible with the 57.STPL.B. Milano Straps offers a complete collection of artisanal straps in this size: alligator, calfskin, NATO and rubber. Each piece can be personalised at our Atelier Casati Milano to ensure finishes and details tailored to your watch.

Durability depends on the tanning method and usage. Quality vegetable-tanned calfskin resists 3-5 years of daily use, developing a fascinating patina. Alligator, being more robust, lasts over 5-7 years. FKM rubber lasts 4-6 years. Natural leather wear is part of its beauty; when necessary, replacement is simple and the strap can be easily changed.