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Breitling · Chronomat 40 GMT

Strap for Breitling Chronomat Automatic GMT 40 NFL Kansas City Chiefs Edition

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm
20 mm strapsAll Breitling
Lug width20 mm
Case diameter40 mm
ReferenceA32398B81K1A1
FamilyChronomat 40 GMT
MovementBreitling caliber Caliber 32 Hours, Minutes, Seconds, Additional 24 Hour Hand (adjustable) | Date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

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The Chronomat 40 GMT A32398B81K1A1, seen from the bench

The Breitling Chronomat 40 GMT A32398B81K1A1 with 20mm lug width combines forty years of instrument evolution since 1984. This 40mm stainless steel case features the Breitling Caliber 32 manufacture movement with 47 chronometric complications certified COSC, offering true dual time-zone capability via an independent 24-hour hand. The mixed finish case with unidirectional bezel and structured dial echoes aeronautical control panels, delivering professional-grade reliability beyond decorative aesthetics.

Frequently asked questions

What is the lug width of the Breitling Chronomat 40 GMT A32398B81K1A1?

The Breitling Chronomat 40 GMT A32398B81K1A1 has a lug width of 20mm. This is the measurement to use when selecting any aftermarket strap compatible with this reference.

What is the best strap for the Breitling Chronomat 40 GMT?

For the Chronomat 40 GMT, a vegetable-tanned alligator belly strap offers the best balance between instrumental character and formal refinement. Shell cordovan develops a unique organic patina over time, whilst heavy nylon NATO straps maintain coherence with the model's aviation aesthetic.

How do I change the strap on a Breitling Chronomat 40 GMT?

The strap is removed using a flat-tipped spring bar tool or a dedicated lever instrument, applying gentle pressure to the spring bar connecting the strap to the case lug. The operation does not require case opening and can be performed independently with the correct tools, or entrusted to a specialist atelier for precise fitting.

Are there aftermarket straps compatible with the Breitling Chronomat 40 GMT A32398B81K1A1?

Yes. All straps with a 20mm attachment width are compatible with the Breitling Chronomat 40 GMT A32398B81K1A1. Milano Straps offers a curated selection of artisan leather, rubber and textile straps specifically calibrated for this lug width, available online or customisable at the Casati Milano atelier.

How long does a leather strap last on a Breitling Chronomat 40 GMT?

Longevity depends on leather type and daily use. A quality vegetable-tanned alligator strap, with periodic conditioning and rotation between straps, can last between three and five years whilst maintaining structural and aesthetic integrity. Shell cordovan, owing to the density of the equine cordovan fibres, is amongst the most durable leathers available for watchmaking straps.

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