Breitling · Navitimer

Strap for Navitimer 1 B01 Chronograph 46 Stainless Steel / Black / Calf / Folding

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

Lug width24 mm
Case diameter46 mm
ReferenceAB0127211B1X2 (aka: AB012721-BG78-442X-A20D.1)
FamilyNavitimer
MovementBreitling caliber B01 hours, minutes, small seconds | date | Chronograph, column wheel | chronometer
Year2018
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 Navitimer AB0127211B1X2 (aka: AB012721-BG78-442X-A20D.1)

Selected for the 24 mm lug width · workshop selection

All 24 mm straps →

The Navitimer AB0127211B1X2 (aka: AB012721-BG78-442X-A20D.1), seen from the bench

The Navitimer 1 B01 Chronograph 46 is a 46mm stainless steel case chronograph with a 24mm lug width, featuring the Breitling B01 manufacture movement rated COSC chronometer with 70-hour power reserve and 28,800 vph oscillation frequency. The model AB012721-BG78-442X-A20D.1 (commercial reference AB0127211B1X2) preserves the professional pilot instrument heritage from 1952, combining a dual-scale logarithmic bezel calculator with 30m water resistance and integrated date window at 3 o'clock beneath the chronograph minute subdial. A column wheel mechanism ensures precise chronograph engagement without drift over time.

Frequently asked questions

What is the lug width of the Breitling Navitimer AB0127211B1X2?

The Breitling Navitimer AB0127211B1X2 features a lug width of 24mm. This generous measurement is consistent with the 46mm case diameter and requires straps cut to precise tolerances to ensure a snug, play-free fit between the lugs.

What is the best strap for the Breitling Navitimer 46mm?

The most coherent options for the Navitimer 46mm are: smooth-belly alligator leather for formal-sport occasions, vegetable-tanned Tuscan calf for those who appreciate a developing patina, vulcanised rubber for sporting contexts, and ballistic nylon NATO for maximum fidelity to the original aviation aesthetic. A steel deployant clasp is recommended on any material to maintain visual symmetry with the case.

How do I change the strap on a Breitling Navitimer AB0127211B1X2?

Strap replacement is carried out using a flat-tip springbar tool. The spring bars on the Navitimer 46mm are standard diameter and compress easily without risk of scratching the case. It is advisable to work on a soft surface and to replace the spring bars every two strap changes to prevent accidental failures.

Are there aftermarket straps compatible with the Navitimer 46mm?

Yes. Any strap with a 24mm lug width is technically compatible with the Breitling Navitimer AB0127211B1X2. Milano Straps offers a range of handcrafted 24mm straps in various materials — leather, alligator, NATO, rubber — all cut to tolerance of ±0.1mm for a precise fit.

How long does a leather strap last on a Navitimer?

Strap longevity depends on material, finishing and conditions of use. A quality vegetable-tanned calf strap, with moderate daily wear and regular conditioning (colourless cream every 30–45 days), maintains structural integrity for 2–4 years. Alligator leather, being denser and more moisture-resistant, can exceed 5 years with the same care. Milano Straps products carry an 18-month warranty 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