Breitling · Chronomat B01 44

Strap for Chronomat 47 GMT Stainless Steel / Metallica Brown / Rubber

Takes 24 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width24 mm
Case diameter47 mm
ReferenceAB041012.Q586.135S
FamilyChronomat B01 44
MovementBreitling caliber Caliber B04 Hours, Minutes, Small Seconds, Additional 24 Hour Hand (adjustable) | Date | Chronograph, Column wheel | Chronometer
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 Chronomat B01 44 AB041012.Q586.135S

Selected for the 24 mm lug width · workshop selection

All 24 mm straps →

The Chronomat B01 44 AB041012.Q586.135S, seen from the bench

The Breitling Chronomat B01 44 (AB041012.Q586.135S) traces its lineage to 1984 and represents a contemporary evolution of professional chronograph design. This 47 mm stainless steel case houses the B01 caliber, an internal Breitling movement COSC-certified as a chronometer, featuring column wheel and cam architecture, 28,800 vph frequency, and 70-hour power reserve. The dial displays hours, minutes, running seconds at 6 o'clock, independent 24-hour GMT hand, and date window at 3 o'clock. The 24 mm lug width is engineered to match the case proportions and requires straps with reinforced internal structure and precision-shaped tips.

Frequently asked questions

What is the lug width of the Breitling Chronomat B01 44 AB041012.Q586.135S?

The lug width of the Breitling Chronomat B01 44 AB041012.Q586.135S is 24 millimetres. This measurement is specific to the Chronomat 44 line and should be verified using a digital calliper placed between the two lugs at the strap attachment point.

What is the best strap for the Breitling Chronomat B01 44 AB041012.Q586.135S?

For a 47 mm case with a 24 mm lug width, the most suitable straps are vegetable-tanned alligator (for formal or business occasions), box-calf leather (for daily wear) and moulded rubber (for those wishing to preserve the Chronomat's sporting, tool-watch character). A 24 mm nylon NATO strap is ideal for frequent rotation.

How do you change the strap on a Breitling Chronomat B01 44?

The strap is removed using a flat-tipped springbar tool, applying pressure to the springbar tabs inside the lugs. The Chronomat B01 44 has solid lugs that require a quality springbar tool to avoid scratching the case finishing. Work on a soft surface and replace the springbars if they show signs of wear.

Are there aftermarket straps compatible with the Breitling Chronomat B01 44 AB041012.Q586.135S?

Yes, any strap with a 24 mm lug width and standard length (approximately 75/115 mm or 75/120 mm depending on wrist circumference) is compatible with the Chronomat B01 44. MilanoStraps offers a selection of handcrafted 24 mm straps made to order, with buckle or deployant clasp, in a range of materials and colours.

How long does a leather strap last on a Breitling Chronomat B01 44?

Longevity depends on the material and frequency of wear. A quality vegetable-tanned alligator strap, properly maintained (regular conditioning, rotation with other straps), typically lasts between three and five years. Box-calf leather is slightly less durable but more resistant to everyday moisture. Shell cordovan, owing to its dense fibre structure, can exceed five years while developing a highly regarded patina.

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