Bremont · Boeing

Strap for Boeing Model 247 Black

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

Lug width20 mm
Case diameter43 mm
Reference247BK
FamilyBoeing
MovementBremont caliber BE-50AE hours, minutes, small seconds | date | Chronograph | chronometer
Year2014
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 Boeing 247BK

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Boeing 247BK, seen from the bench

The Bremont Boeing 247BK is a 43mm chronograph combining British watchmaking craftsmanship with American aviation engineering. It features a Bremont caliber BE-50AE automatic movement with hours, minutes, small seconds, date, and chronograph function with chronometer certification. The stainless steel case is treated for marine corrosion and material fatigue resistance. The 20mm lug width ensures visual balance with the 43mm diameter case and determines strap compatibility.

Frequently asked questions

What is the lug width of the Bremont Boeing 247BK?

The lug width of the Bremont Boeing 247BK is 20mm. This measurement determines strap compatibility and should be verified by measuring the linear distance between the two lugs on the 43mm case.

Which strap is most suitable for the Bremont Boeing 247BK?

For the aeronautical character of the 247BK, a black alligator strap with vegetable tanning represents the choice of structured elegance, whilst mahogany brown leather creates a warmer chromatic relationship. For more instrumental use, a NATO strap in royal blue balloon weave or a black FKM rubber strap remain coherent with the heritage.

How do I change the strap on my Bremont Boeing 247BK?

Remove the lugs from the case using an appropriate tool (typically a spring-loaded strap remover or thin screwdriver). Check whether the attachment is bayonet or screw-based. Insert the new lugs into the 20mm-compatible strap, ensuring the passant sits snugly without any looseness.

Can I use an aftermarket strap with my Bremont Boeing 247BK?

Yes, provided the strap is specifically sized for 20mm lug width and manufactured with quality materials (vegetable-tanned leather, certified technical textiles, FKM rubber). Artisanal straps offer superior compatibility and personalisation compared to generic industrial solutions.

What is the average lifespan of a leather strap for the Bremont Boeing 247BK?

An alligator or vegetable-tanned leather strap lasts approximately 3–5 years with regular wear, depending on climate and frequency of use. The patina that develops is desirable, marking the passage of time. A NATO cotton strap lasts longer (10+ years), whilst FKM rubber maintains elasticity for approximately 7–10 years before progressive hardening.

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