Bell & Ross · Instruments

Strap for BR S Matte Black Ceramic

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

Lug width20 mm
Case diameter39 mm
ReferenceBRS-BL-CEM
FamilyInstruments
MovementBell & Ross caliber BR-CAL.102 hours, minutes, small seconds | date | chronometer
Year2016
CaseCeramic

Spring bar

Swiss Standard universal spring bars

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

Straps for the Instruments BRS-BL-CEM

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Instruments BRS-BL-CEM, seen from the bench

The Bell & Ross Instruments BRS-BL-CEM is a chronograph with matte black ceramic case and 39 mm diameter, housing the certified BR-CAL.102 movement featuring hours, minutes, small seconds, and date. The 20 mm lug width is specific to this model and accommodates a wide range of artisanal straps while maintaining proper visual proportion. Black ceramic offers superior scratch resistance compared to steel, and the hexagonal indices facilitate readability in difficult light conditions.

Frequently asked questions

What is the lug width of the Bell & Ross Instruments BRS-BL-CEM?

The Bell & Ross Instruments BRS-BL-CEM features a 20-millimetre lug width, measured between the case attachment pins. This dimension is standard for contemporary sports chronographs and permits the use of an extensive range of bespoke leather straps without construction compromise.

What is the best strap for the Bell & Ross Instruments BRS-BL-CEM?

The ideal strap depends upon your lifestyle and aesthetic preferences. Natural alligator offers characteristic grain and patina evolution over time, creating refined contrast with the black ceramic case. Supple calf leather values the case's slender proportion. For robust solutions, vegetable-tanned leather develops deep patina that pairs naturally with ceramic, acquiring character through daily wear.

How do I change the strap on my Bell & Ross BRS-BL-CEM?

The Bell & Ross strap is changed by using a specialised tool to remove the attachment pins (the small metal cylinders connecting case and strap). Position your watch on a soft cloth, locate the pins at the case sides, and use the appropriate tool to extract them gently in the ansa-to-case-back direction. Once removed, slide the old strap away and insert the new one before reinserting the pins. If inexperienced, consult a professional.

Can I use a compatible aftermarket strap on my Bell & Ross?

Yes, you may use a bespoke aftermarket leather strap specific to the 20mm lug width specification. The critical factor is that the strap be custom-made or appropriately adjusted to this exact width, avoiding applications that are too wide (which would damage the case corners) or too narrow (creating anomalous tension on the attachment pins).

How long does a leather strap last on this watch?

Leather strap longevity depends upon construction quality and usage patterns. A bespoke strap in premium alligator or calf, with proper craftsmanship and stitching, can endure 3-5 years under daily use with regular maintenance (gentle cleaning and occasional conditioning). Vegetable-tanned leather straps develop enhanced patina over time, ageing with greater elegance. Eighteen-month guarantees are standard for quality sartorial work, covering manufacturing defects.

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