Strap for Horological Machine N°5 HM5 CarbonMacrolon

The MB&F Horological Machines 55.CMT.B features a lug width of 20mm. This measurement is critical when selecting a replacement strap: the distance between the case lugs is exactly 20 millimetres. Ensure your chosen strap is specifically designed for this measurement, avoiding 18mm or 22mm options which will not fit correctly.

For the HM55, an alligator strap in black or brown is the most elegant choice, maintaining visual focus on the watch's high-complication mechanics. Alligator leather does not compete with the case's presence. Alternatively, vegetable-tanned calf leather or a robust nylon NATO strap offer versatility, whilst vulcanised rubber provides practicality and water resistance.

Strap change is accomplished via the spring bars connecting the strap to the case lugs. Position the watch on a protective cradle, use a spring bar tool to compress the bars and slide the strap free from the lugs. Insert the new strap, aligning the holes with the spring bars, and release the bars once positioned. Verify secure attachment before wearing.

Yes, any quality artisanal strap with a 20mm lug width is fully compatible with the HM55. Aftermarket straps allow personalisation according to your aesthetic preferences without compromising functionality. Always verify the strap is genuinely 20mm and that spring bars are correctly sized for the case.

A quality artisanal alligator or calf leather strap offers a lifespan of 4-7 years with proper maintenance, varying by usage frequency and climate conditions. Vegetable-tanned leather tends to patina rather than degrade, improving over time. Rubber and NATO straps have superior durability (8-10 years) due to synthetic materials. Regular maintenance with appropriate products significantly extends strap lifespan.