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MB&F · Horological Machines

Strap for Horological Machine N°9 HM9 Flow Road Edition

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

Lug width

20mm
20 mm strapsAll MB&F
Lug width20 mm
Case diameter49 mm
Reference90.TL.RB
FamilyHorological Machines
MovementMB&F caliber HM9 Hours, Minutes | Power Reserve Indicator
CaseTitanium

Spring bar

Swiss Standard universal spring bars

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

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Straps for the Horological Machines 90.TL.RB

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Horological Machines 90.TL.RB, seen from the bench

The MB&F Horological Machine N°9 (HM90) Flow Road Edition features a 49mm titanium aerospace case housing the in-house MB&F HM9 calibre. This radical timepiece showcases a visible tourbillon, power reserve indicator, and hours-minutes functions on a highly legible dial. The 20mm strap lug width accommodates this sculptural three-dimensional horological machine that prioritises engineering logic over conventional watchmaking aesthetics.

Frequently asked questions

What is the exact lug width of the MB&F Horological Machines 90.TL.RB?

The 90.TL.RB features a lug width of precisely 20mm, determined by the specific geometry of the titanium lugs. This measurement is critical: it is incompatible with 18mm straps (too narrow) or 22mm straps (too wide). To verify, measure the distance between the two spring bar holes: it must be exactly 20mm. A measurement error poses structural risks to the lug and strap attachment.

Which strap material is recommended for the titanium case of the 90.TL.RB?

Titanium requires straps that complement its aesthetic without competing. Natural alligator in neutral tones (black, cognac brown, smoke grey) offers a compelling contrast whilst preserving the minimalist concept. Vegetable-tanned calf permits organic patina development over time. A cotton ballistic NATO is the most contemporary option. FKM rubber represents the most radical choice, amplifying the engineering essence of the case.

How do I safely change the strap on my MB&F 90.TL.RB?

Use a dedicated spring bar tool to carefully lift the elastic pins from the lugs. Never apply direct force to the titanium case, which can scratch permanently. Remove the old strap by inserting the tool into the lower lug, lift the pin, extract it, and repeat at the top. To install the new strap, align the pins with the lugs, press firmly until the elastic click, and verify that the strap is centred and the pins are fully seated.

Can I fit an aftermarket quality strap on this model?

Absolutely. Milano Straps offers a complete collection of <a href="https://milanostraps.it/collections/cinturini-orologi-per-misura-ansa-20mm">20mm straps</a> compatible with the 90.TL.RB, crafted by artisans specialising in premium leather, NATO, and rubber. The critical requirement is respecting the lug width: 20mm is the only correct size. We advise against generic straps from mass e-commerce platforms: construction quality and fit integrity determine longevity and comfort.

How long does a leather strap last on a large watch like the 90.TL.RB?

Durability depends on usage intensity and leather quality. A naturally-tanned alligator or calf strap, worn daily, maintains structural integrity for 3–5 years; patina improves. A low-grade leather strap from mass-market sources degrades within 12–18 months. The 90.TL.RB, being a sartorial luxury piece, deserves a strap designed to endure: Casati Milano's artisans craft straps engineered to evolve alongside the watch.

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