Strap for Horological Machine N°5 HM5 Red Gold

The MB&F Horological Machines 55.RL.B features a lug width of 20mm. This measurement represents the internal distance between the two attachment lugs and determines strap compatibility with the timepiece. To verify measurement accurately, position a digital calliper perpendicularly to the lugs and measure the internal clearance.

For the MB&F Horological Machines 55.RL.B, we recommend high-grade alligator straps (Hermès or equivalent), vegetable-tanned calf leather in deep tones, nylon NATO straps for sporty use, or structured FKM rubber. Selection depends on intended wear: alligator for formal occasions, calf for daily versatility, NATO and rubber for technical dynamism that complements the three-dimensional case geometry.

Strap replacement requires a specific spring bar tool (available in two versions: flat-tipped and forked). Position the tool beneath the lug pin from the interior side, apply downward pressure to compress the spring, and gently extract the pin. Next, align the new strap holes with the lugs and reinsert the spring bar pin. Verify complete engagement of the pin before wearing the timepiece.

Yes, any strap with a 20mm lug width is compatible with the MB&F 55.RL.B, regardless of brand. However, we recommend selecting high-quality straps from specialist suppliers to ensure impeccable finishing and longevity. Avoid generic straps that may present construction imperfections or finishes inadequate to this luxury watch's specifications.

A quality leather strap (alligator, vegetable-tanned calf) has an average lifespan of 3-5 years with moderate daily use. Durability depends on frequency of wear, humidity and perspiration exposure, and maintenance practices. Vegetable-tanned calf develops a natural patina that enhances character over time. We recommend rotating with alternative straps to extend leather longevity and allow structural rest between wears.