Breitling · Chronomat B01 44

Strap for Chronomat 47 GMT Stainless Steel / Blackeye Gray

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.F556.441X
FamilyChronomat B01 44
MovementBreitling caliber B04 hours, minutes, small seconds, Additional 24 hours Hand (adjustable) | date | Chronograph, column wheel | chronometer
Year2011
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.F556.441X

Selected for the 24 mm lug width · workshop selection

All 24 mm straps →

The Chronomat B01 44 AB041012.F556.441X, seen from the bench

The Chronomat B01 44 is powered by the automatic B04 caliber with column-wheel chronograph and adjustable GMT function. The watch is chronometer certified and features hour, minute, small seconds, additional 24-hour indicator and date display. The case has 24mm lugs.

Frequently asked questions

What is the lug width of the Breitling Chronomat B01 44 AB041012.F556.441X?

The lug width is exactly 24mm. This measurement is specific to this model and requires straps calibrated to this dimension to ensure perfect fit into the watch case attachment pins.

What is the best strap for the Breitling Chronomat B01 44 AB041012.F556.441X?

The choice depends on intended use: dark alligator for formal elegance, calf leather for business-casual versatility, Parachute nylon NATO for daily sportiness, vulcanised rubber for pure operational character. All must respect the 24mm lug width.

How do I change the strap on my Breitling Chronomat B01 44 AB041012.F556.441X?

Obtain a spring bar removal tool. Position the watch on its side, insert the thin blade into the hole adjacent to the pin, gently lift until release. Repeat on the opposite side. Insert the new strap's pins into the case lugs and push until fully locked into position.

Can I use an aftermarket compatible strap with my Chronomat B01 44?

Yes, provided it respects the 24mm lug width specification. Artisanal brands such as Milano Straps offer aftermarket straps of superior quality, customisable in material, colour and stitching thread, with longer longevity and aesthetic flexibility than OEM straps.

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

Durability varies based on material and usage: alligator lasts 3–4 years with regular maintenance, calf 2–3 years. Vegetable-tanned leather develops patina durably, requiring only occasional conditioning. Constant friction and perspiration shorten life; rotating between multiple straps extends the longevity of each.

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