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-CMAT/SRB
FamilyInstruments
MovementETA caliber E61.511 Hours, Minutes, Small Seconds | Date | Chronometer
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-CMAT/SRB

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Instruments BRS-BL-CMAT/SRB, seen from the bench

The Bell & Ross Instruments with reference BRS-BL-CMAT/SRB is equipped with the ETA E61.511 caliber with chronometer certification. The movement indicates hours, minutes, small seconds and date. The watch is part of the Instruments collection of the French brand specialized in aviation-inspired timepieces.

Frequently asked questions

What is the lug width of the Bell & Ross Instruments BRS-BL-CMAT/SRB?

The lug width (ansa measure) of the BRS-BL-CMAT/SRB is 20mm. This dimension is determined by the width of the ceramic square case and represents the available space between the integrated lugs for strap accommodation.

What is the best strap for the Bell & Ross Instruments BRS-BL-CMAT/SRB?

The choice depends on intended usage. For a classic-elegant profile, we recommend black matte alligator or vegetable-tanned calf leather in grey tones. For a technical approach consistent with the Instruments identity, vulcanized rubber straps with titanium deployante maintain the model's operational character.

How do I change the strap on the BRS-BL-CMAT/SRB?

Insert a spring bar tool between the lug and the strap, applying light pressure to disengage the spring underneath the bar. Carefully extract the old strap, then lodge the bar in the new strap ensuring both ends are perfectly seated in the cavities.

Which aftermarket straps are compatible with the Bell & Ross Instruments BRS-BL-CMAT/SRB?

All straps with a 20mm lug width are compatible with the BRS-BL-CMAT/SRB. Milanostraps offers a curated selection of artisanal straps in alligator, calf leather, vegetable-tanned leather, rubber and technical materials, customisable in size and finish.

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

A vegetable-tanned leather strap, under regular use, maintains structural integrity for 4-6 years. Alligator, though more delicate, can last 5-7 years. Lifespan increases significantly with periodic maintenance (conditioning with specific creams) and rotation with other straps. Vulcanized rubber straps last 3-5 years before requiring replacement.

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