MB&F · Horological Machines

Strap for Horological Machine N°6 Space Pirate HM6-SV Platinum

Integrated bracelet: measurements, the most common questions, and the way to a made-to-measure strap.

Integrated bracelet

The MB&F Horological Machines 60.SPL.B is designed with a bracelet integrated into the case. For a compatible made-to-measure strap, the Casati Milano atelier builds it on your watch.

Case diameter50 mm
Reference60.SPL.B
FamilyHorological Machines
MovementMB&F caliber HM6 Hours, Minutes | Tourbillon escapement
Year2016
CasePlatinum, Sapphire

Spring bar

Swiss Standard universal spring bars

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

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

The Horological Machine No. 6 represents one of MB&F's contemporary creations in the field of mechanical art watches. The timepiece is equipped with the HM6 caliber with a tourbillon regulator and hour and minute indications. The 60.SPL.B reference features a three-dimensional construction that integrates the movement into an unconventional configuration.

Frequently asked questions

Can you fit a standard strap to the MB&F Horological Machines 60.SPL.B?

No, this model does not use conventional straight bars: the lug is an integral part of the case design and follows a proprietary geometry. The only correct solution is a strap built to measure, directly on the watch, by <a href="/pages/casati-booking">Casati Milano</a>, by appointment only.

How exactly does the bespoke strap construction process work?

Casati Milano's atelier begins with direct measurement of the watch: the exact dimensions of the proprietary lug, the shape of the contact points, and the angle of wrap around the wrist are recorded with precision. The strap is then constructed by hand on the watch itself, ensuring perfect adherence to the case geometry without compromise.

Which type of leather best suits the character of the MB&F Horological Machines 60.SPL.B?

Given the visionary and contemporary nature of the piece, leathers with pronounced grain (suede, vegetable-tanned nubuck) create a fascinating material contrast with the platinum. Crocodile and alligator amplify the sculptural character; minimalist box calf in grey, black or white tones creates chromatic harmony with the case.

How long does a well-made artisanal strap last?

A strap crafted according to sartorial craftsmanship principles, using superior-quality leathers and traditional stitching techniques, lasts many years. Longevity depends on use, maintenance, and the type of leather chosen; vegetable tanning and exotics age gracefully, developing patina and character over time.

Why doesn't the MB&F Horological Machines 60.SPL.B have a standard strap lug?

Maximilian Büsser conceived the 60.SPL.B as a three-dimensional sculpture where every constructive element obeys a rigorous logic of proportion and visual flow. The lug is not a secondary detail, but a natural extension of the case's form; for this reason it requires a bespoke strap that fully respects the original intention.

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