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Bell & Ross · Instruments

Strap for BR S Steel

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 Bell & Ross
Lug width20 mm
Case diameter39 mm
ReferenceBRSBLSTSRB
FamilyInstruments
MovementETA caliber E61.511 hours, minutes, small seconds | date | chronometer
CaseStainless Steel

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 Instruments BRSBLSTSRB

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Instruments BRSBLSTSRB, seen from the bench

The Bell & Ross Instruments BRSBLSTSRB embodies the watchmaking philosophy centered on eliminating excess in favor of pure functionality. This model from the Instruments collection features a 39 mm stainless steel case and a 20 mm lug width, delivering instrument-level readability inspired by 1940s aviation cockpit designs. The watch houses an ETA caliber E61.511 movement, COSC-certified chronometer, guaranteeing precision within ±4 seconds per day. The square case, Arabic numerals, anti-glare treatment, and hour/minute/small seconds indicators with date window maintain a clutter-free dial for quick reading in low light.

Frequently asked questions

What is the lug width of the Bell & Ross Instruments BRSBLSTSRB?

The Bell & Ross Instruments BRSBLSTSRB features a 20-millimetre lug width. This measurement is standard on the 39mm case and is compatible with a wide range of aftermarket straps available online and at the Casati Milano atelier.

What is the best strap for the Bell & Ross Instruments BRSBLSTSRB?

The choice depends on intended usage. For a military heritage aesthetic, we recommend vegetable-tanned alligator or Italian calf leather. For functionality in humid environments, NATO fabric is optimal. Natural vulcanised rubber is the solution for those using the watch in laboratory or construction settings. Milano Straps offers all these options, customisable at the Casati Milano atelier.

How do I change the strap on the Bell & Ross Instruments BRSBLSTSRB?

The BRSBLSTSRB uses a standard straight bar attachment with 20mm width. Using a dedicated removal tool, gently extract the bars by pushing from the inside of the case. Insert the new bars into the strap purchased from Milano Straps, ensuring they are perfectly aligned. If unsure, the Casati Milano team can perform the change by appointment.

Can I use a compatible aftermarket strap from a different brand on my BRSBLSTSRB?

Yes, the BRSBLSTSRB is compatible with any strap that respects the 20mm lug width specification. However, we recommend artisanal certified straps such as those from Milano Straps, which guarantee construction quality and longevity. The Casati Milano atelier creates bespoke pieces with meticulous attention to proportions that visibly enhance the overall aesthetic.

How long does a leather strap last on the Bell & Ross Instruments BRSBLSTSRB?

A quality leather strap, such as those crafted by Milano Straps, typically lasts 3-5 years with moderate daily use, provided proper maintenance is observed. Vegetable-tanned leather ages nobly, developing a unique patina. Casati Milano provides an 18-month warranty on bespoke straps and recommends annual conditioning treatment to extend the life of the piece.

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