MB&F · Horological Machines

Strap for Horological Machine N°6 Space Pirate HM6 Final Edition

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter50 mm
Reference60.SL.B
FamilyHorological Machines
MovementMB&F caliber HM6 Hours, Minutes | Tourbillon Escapement
CaseTitanium

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Horological Machines 60.SL.B

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Horological Machines 60.SL.B, seen from the bench

The MB&F Horological Machine N°6 Space Pirate (HM6) Final Edition is a 49.50mm titanium grade 5 timepiece featuring the MB&F HM6 caliber with tourbillon and special escapement, developed with Chronode. The case presents a spatial volumetric architecture with unconventional tourbillon positioning visible through the dial. Hours and minutes emerge through dedicated windows, with a lugs width of 20mm designed to maintain proportional balance with the sculptural case. This piece exemplifies haute horlogerie where engineering meets contemporary design language.

Frequently asked questions

What is the lug width of the MB&F Horological Machines 60.SL.B?

The MB&F Horological Machines 60.SL.B features a lug width of 20mm. This dimension is critical for strap compatibility and should be verified using a digital calliper positioned directly between the inner lugs of the case.

Which strap is most suitable for the MB&F Horological Machines 60.SL.B?

The 60.SL.B demands straps that respect its austere visual language. Black satin alligator maintains the monochromatic integrity of the titanium case. Vegetable-tanned leather in grey-blue tones offers evolving patina. Grey-charcoal NATO and black FKM rubber align with the mechanical austerity of the piece.

How do I change the strap on my MB&F Horological Machines 60.SL.B?

Position the watch on a soft surface with the dial facing downward. Locate the spring bars (pass-through bars) connecting the strap to the case lugs. Use a dedicated watch strap removal tool to extract the bar by gently pushing from the opposite side. Repeat for both lugs. Insert the new strap by sliding the spring bar through the lugs until fully seated.

Can I use an aftermarket strap on an MB&F Horological Machines 60.SL.B?

Yes, any strap with a 20mm lug width is compatible. However, given the sculptural and rigorous character of the 60.SL.B, we recommend artisanal, high-quality straps that respect the geometry and aesthetic of the case. Avoid limp materials or discordant textures: the strap integrates the identity of the timepiece.

How long does a leather strap last on a 49.50mm watch case like the HM60?

A quality strap with vegetable tanning typically lasts 3-5 years with daily wear. Durability depends on case weight (the 60.SL.B's titanium reduces stress) and leather treatment. The patina that develops is part of natural ageing. To extend lifespan, alternate straps and protect the leather from excessive moisture.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only