MB&F · Horological Machines

Strap for Horological Machine N°6 Space Pirate HM6 RT

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

Integrated bracelet

The MB&F Horological Machines 60.RL.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.RL.B
FamilyHorological Machines
MovementMB&F caliber HM6 Hours, Minutes | Tourbillon escapement
Year2015
CaseTitanium, Red Gold

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.RL.B, seen from the bench

The Horological Machine HM6 represents one of MB&F's most complex creations in the field of contemporary haute horlogerie. The timepiece is equipped with the in-house HM6 caliber featuring a tourbillon escapement and hour and minute indication. The 60.RL.B reference is distinguished by the three-dimensional architecture of the movement visible through the dial.

Frequently asked questions

Can a standard strap be fitted to the MB&F Horological Machines 60.RL.B?

No, the lug attachment does not follow standard industrial straight-bar specifications; it is an integral part of the case design. A generic strap has no chance of proper adaptation. The solution is to have a made-to-measure strap built directly onto the watch—a procedure <a href="/pages/casati-booking">Casati Milano</a> performs through artisanal measurement and sequential prototyping.

How does the bespoke strap construction process work for the 60.RL.B?

The craftsman takes direct measurements of the watch, recording lug attachment points, angles, diameters and all geometric elements of the case with precision. Subsequently, the master selects the leather, discusses finish and colour with the collector, and builds the strap with sequential fitting until perfect adherence and proportion are achieved. It is co-creation between expert and owner.

Which leather suits the character of the MB&F Horological Machines 60.RL.B?

The 60.RL.B calls for leathers with marked texture and visible grain: structured alligator, African kudu, cordovan in deep tones communicate with the audacious and biomechanical nature of the case. Saturated colours—black, burgundy, midnight blue—emphasise volumetric geometry. Natural tones also work when accompanied by incised grain that dialogues with the case's complex planes.

How long does a strap made by Casati Milano last?

A strap crafted according to Casati Milano's artisanal standards—selected leather, hand-executed stitching, quality buckles and hardware—endures years of daily wear, developing patina and character over time. Longevity depends on maintenance: protection from extreme humidity, regular cleaning and proper storage ensure decades of reliability.

Why does the MB&F Horological Machines 60.RL.B not have traditional lugs?

The absence of removable lugs is a radical stylistic choice: the 50mm case in titanium and red gold is conceived as a unitary sculpture, where every element—including strap attachment points—is integrated into the overall design. This rejection of industrial modularity reflects MB&F's philosophy of creative freedom and watchmaking as three-dimensional art.

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