Breitling · Colt

Strap for Colt 44 Black / Bracelet

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width22 mm
Case diameter44 mm
ReferenceA7438710.BB50.157A
FamilyColt
MovementBreitling caliber B74 hours, minutes, seconds | date | chronometer
Year2011 - 2014
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

Straps for the Colt A7438710.BB50.157A

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Colt A7438710.BB50.157A, seen from the bench

The Breitling Colt A7438710.BB50.157A is a 44mm stainless steel professional instrument watch rooted in military supply programs from the 1960s. It features the automatic B74 caliber with bidirectional winding, COSC-certified with a daily variation of −4/+6 seconds, regulating hours, minutes, seconds, and date. The dial is engineered for maximum contrast and readability, complemented by a bezel with precise graduations, while the anti-reflective sapphire crystal ensures legibility in extreme conditions. Designed with a 22mm lug width for specific strap proportions, the case geometry maintains the tool-watch philosophy with no decorative compromise—every detail serves function.

Frequently asked questions

What is the lug width of the Breitling Colt A7438710.BB50.157A?

The lug width of the Breitling Colt A7438710.BB50.157A is 22mm. This measurement is taken with a calliper at the inner gap between the two lugs, at the point where the strap meets the case. It is essential to use straps built precisely to this dimension to ensure correct fitting and accurate visual alignment with the case.

What is the best strap for the Breitling Colt A7438710.BB50.157A?

The choice depends on intended use. For formal or business settings, a black or tobacco-brown belly alligator strap in vegetable-tanned leather complements the stainless steel case without compromising the tool-watch character of the Colt. For daily and sport use, a premium nylon NATO or vulcanised rubber strap maintains coherence with the aeronautical heritage and ensures durability. All recommended models are available in 22mm on milanostraps.it.

How do you change the strap on the Breitling Colt A7438710.BB50.157A?

To replace the strap, a springbar tool is required to remove the spring bars securing the strap to the case lugs. Insert the tool into the small notch at the end of the spring bar, compress it and slide the strap free. Care must be taken to avoid scratching the polished lug surfaces. If in doubt, it is advisable to consult a watchmaker or the Casati Milano atelier.

Are there aftermarket straps compatible with the Breitling Colt A7438710.BB50.157A?

Yes. Any strap with a 22mm lug width is technically compatible with the Breitling Colt A7438710.BB50.157A, provided the spring bars are of standard diameter (1.8mm) and the length of both halves (long and short taper) is appropriate for the wearer's wrist circumference. Milano Straps handcrafted straps in 22mm are made to fit this model precisely without any modification.

How long does a leather strap last on a Breitling Colt?

The lifespan of a leather strap depends on material, craftsmanship and care. A quality vegetable-tanned calf strap, with moderate daily wear, typically lasts 18 to 36 months before wear at the keeper or buckle area requires replacement. A first-selection belly alligator strap, kept away from water and excessive perspiration, can exceed three years. Shell cordovan, owing to its dense fibre structure, is among the most long-lasting materials available. Milano Straps offers an 18-month guarantee against 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