Breitling · Navitimer

Strap for Navitimer Rattrapante Stainless Steel / Black / Croco / 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 diameter45 mm
ReferenceAB031021/BF77/757P/A20D.1
FamilyNavitimer
MovementBreitling caliber B03 hours, minutes, small seconds | date | Chronograph, column wheel, Rattrapante | 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 AB031021/BF77/757P/A20D.1

Selected for the 24 mm lug width · workshop selection

All 24 mm straps →

The Navitimer AB031021/BF77/757P/A20D.1, seen from the bench

The Navitimer is a Breitling chronograph equipped with the in-house B03 caliber, featuring a split-seconds function and chronometer certification. The movement has a column-wheel and offers hours, minutes, small seconds, date, and chronograph indications. The watch uses 24mm lugs and integrates the model's signature circular slide rule.

Frequently asked questions

What is the lug width of the Breitling Navitimer AB031021/BF77/757P/A20D.1?

The lug width is precisely 24mm, measured between the inner sides of the lug bars where the strap attaches to the case. This dimension is critical for compatibility: a 22mm or 26mm strap will not fit properly on this model. Always verify the lug width before purchasing an aftermarket strap.

What is the best strap for the 45mm Breitling Navitimer in stainless steel?

The choice depends on intended use and aesthetic preference. Mississipian alligator with vegetable tanning (cognac brown or black) offers timeless elegance and synchronises the case's brushed patina over time. Premium vegetable-tanned calf leather provides tactile warmth with visible patina development. Military polyamide NATO straps deliver functional purism. FKM rubber ensures flexibility in humid climates. All options must respect the 24mm lug width specification.

How do I change the strap on my Breitling Navitimer?

The Navitimer uses spring bar pins (lug bars) to secure the strap to the case lugs. You will require a spring bar tool to compress the internal spring and extract the pin. Insert the tool into the lateral slots of the lug, compress downward, and pull the pin outward. Repeat on the opposite side. Then insert the new strap's spring bars into position, ensuring the pin fully engages. If unfamiliar with this procedure, consult a qualified watchmaker.

Are there aftermarket straps compatible with the Breitling AB031021/BF77/757P/A20D.1?

Yes, all straps with 24mm lug width are fully compatible. Milano Straps offers hand-crafted straps customisable in leather (alligator, calf with vegetable tanning), military NATO, vulcanised rubber, and suede. Each is available in various colours and personalisation options including initials, stitching thread colour, and bespoke length. The Casati Milano atelier creates custom bespoke examples by appointment.

How long does a leather strap last on a daily-worn chronograph?

Durability depends on material quality and wear intensity. A quality hand-crafted alligator or vegetable-tanned calf strap, worn daily, typically withstands 3-5 years before showing visible deterioration (cracking, stitch separation). Regular maintenance (cleaning with damp cloth, sun exposure to regenerate fibres) extends lifespan considerably. Military NATO straps are virtually indestructible unless exposed to extreme humidity. Milano Straps guarantees its straps for 18 months and offers repair and reconditioning services.

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