Strap for BR-X1 Instrument de Marine

The BRX1-CM-313 features a 24mm lug width. This measurement is determined by the volumetric proportions of the 45mm case and must be measured from inner surface to inner surface between the spring bars using a calliper gauge. A precision of ±0.5mm is essential to ensure proper attachment without lateral movement of the strap.

For this aviation chronograph, an alligator leather strap represents the premier option: its naturally structured grain maintains coherence with military heritage and develops patina over time. Chromium-tanned calf leather constitutes a more immediate alternative for those seeking smooth surface and straightforward maintenance. Vegetable-tanned leather straps offer unique character but require periodic conditioning.

The process requires a spring bar tool or extraction device to disassemble the lug pins. Insert the tool into the small lateral hole of the spring, extract the pin with gentle motion, and remove the worn strap. For installing the new 24mm strap, reinsert the pin from top to bottom, verifying that the spring engages correctly on both sides. Avoid hammering or excessive pressure that could damage the titanium case and bronze inserts.

Yes, provided the strap is specifically dimensioned for 24mm lug width. The BRX1-CM-313 accepts quality aftermarket straps, as long as they respect width tolerances. We recommend verifying reviews on materials: alligator, chromium-tanned calf, or vegetable-tanned leather are reliable choices. Avoid straps from unknown brands with imprecise tolerances, which could cause defective attachments.

A quality alligator or calf leather strap offers a lifespan of 3 to 5 years with daily use and periodic maintenance (cleaning with damp cloth, conditioning every six months with appropriate creams). Longevity depends on exposure to moisture, perspiration, and thermal variations. Vegetable-tanned straps, whilst structurally more durable, require frequent conditioning to preserve flexibility. NATO or rubber straps offer superior resistance but require monitoring of pin wear.