Bremont · ALT1

Strap for ALT1-P Pilot Blue

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width22 mm
Case diameter43 mm
ReferenceALT1PBL
FamilyALT1
MovementBremont caliber BE-53AE hours, minutes | date | Chronograph | chronometer
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 ALT1 ALT1PBL

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The ALT1 ALT1PBL, seen from the bench

The Bremont ALT1 is a chronograph equipped with the BE-53AE caliber featuring hour, minute, date and certified chronometer functions. The model features 22mm lugs and integrates a chronograph complication in the movement. The case houses an automatic movement with date indication and chronometer certification.

Frequently asked questions

What is the lug width of the Bremont ALT1 ALT1PBL?

The lug width of the Bremont ALT1-P BL is 22 mm. This measurement is standard across the ALT1 and ALT1-P family and is critical for selecting the correct aftermarket strap. You can verify the lug width by measuring the distance between the spring bars at the point where they exit the case.

Which strap is recommended for the Bremont ALT1 ALT1PBL?

For a chronograph with aviation heritage like the ALT1-P BL, we recommend vegetable-tanned calf leather for formal wear, shell cordovan for decade-long durability, or NATO and vulcanised rubber for humidity resistance and rapid field changes. Your choice depends on deployment environment: civil cockpit, maritime conditions, or general aviation operations.

How do I correctly change the strap on a Bremont ALT1?

Changing the Bremont ALT1 strap requires two tools: a spring bar tool and care not to scratch the case. Insert the tool tip beneath the pin from the underside, apply gentle pressure and rotate the pin outward; it will retract allowing strap removal. Repeat on the opposite side. Reverse the procedure for the new strap, ensuring a secure audible click.

Is an aftermarket strap compatible with the Bremont ALT1-P BL?

Yes, any strap with a 22 mm lug width is compatible with the ALT1-P BL. Milano Straps stocks a comprehensive collection of 22 mm straps in artisanal leather, NATO and rubber, all tested and ready to ship. Always verify that your new strap's spring bars are the correct length for your case.

What is the average lifespan of a leather strap on a Bremont ALT1?

A vegetable-tanned calf leather strap maintains structural integrity for 4–6 years of daily wear, developing distinctive patina throughout. Shell cordovan can exceed 10 years thanks to fibre density. Longevity depends on humidity exposure, direct sunlight and maintenance frequency (periodic cleaning and conditioning). Vulcanised rubber straps last 7–8 years before replacement becomes necessary.

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.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only