MB&F
Horological Machines 90.RL.RB
MB&F Horological Machines 90.RL.RB: strap made to measure on the watch at the Casati Milano atelier, by appointment.
Technical Specifications
MB&F 90.RL.RB90.RL.RB
MB&F caliber HM9 Hours, Minutes | Power Reserve Indicator
The Heritage
The strap for this watch is made to measure
On the MB&F Horological Machines the bracelet is drawn as part of the case: no catalogue strap will fit. In the atelier we take the measurements on the watch itself and build the strap on the piece — that is the work of Casati Milano.
Book a consultation →FAQ
Can a standard strap be fitted to the MB&F Horological Machines 90.RL.RB?
No, not a conventional straight-bar strap. The lug of this model is integrated into the case geometry and requires a bespoke solution. <a href="/pages/casati-booking">Casati Milano</a> creates custom-built straps calibrated precisely to the attachment specifications of your watch, during an atelier consultation where measurements are taken with sartorial precision.
How does the custom strap-making process work for this model?
The process begins with an appointment at <a href="/pages/casati-booking">Casati Milano</a>, where your watch is analysed and the lug dimensions are measured with meticulous care. Subsequently, the Casati craftsmen construct the strap using watchmaking sartorial techniques: thickness calibration, stitch positioning, choice of deployant clasp and keepers. The result is a strap where every element responds to the specific needs of your case.
Which leather type suits the character of the MB&F Horological Machines 90.RL.RB best?
Vegetable-tanned leathers—aged cowhide, cordovan, natural alligator—represent the ideal choice for this timepiece. These materials develop authentic patina and rich texture over time, emphasising the artisanal nature and raw mechanicality of the model. Vegetable leather dialogues with titanium and rose gold without aesthetic compromise, generating material contrast that reinforces the sculptural identity of the machine.
How long does a well-constructed custom strap last?
A strap crafted using Goodyear-welted techniques by <a href="/pages/casati-booking">Casati Milano</a>—visible stitching, double stitching, quality leather—lasts 8–12 years of regular use, in many cases longer. Longevity depends on care, humidity exposure and frequency of wear. Unlike industrial straps, an artisanal piece can be repaired, resurfaced or restored, indefinitely extending its operational life.
Why was the MB&F Horological Machines 90.RL.RB conceived with this particular lug geometry?
The integrated lug within the case is a deliberate choice by Maximilian Büsser: the watch exists as a complete sculptural entity, where every element—from the three-dimensional case to the strap connection point—communicates the same design intention. This approach rejects conformism, requiring anyone who owns this piece to consider the strap not as an interchangeable accessory, but as an inseparable part of the relationship between wrist and machine.