Technical Archive

Breitling
Premier A37340351B1X1— lug 20mm

Breitling Premier A37340351B1X1: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Premier Automatic 40 Stainless Steel / Anthracite / Nubuck Brown / Folding

Artisanal Note

"This model requires a precise 20mm lug width to preserve the original sartorial balance."

Technical Specifications

Breitling A37340351B1X1
Lug Width
20 mm

The essential strap measurement.

Browse 20mm straps →
Reference

A37340351B1X1

Movement

Breitling caliber Caliber 37 Hours, Minutes, Small Seconds | Date

The Heritage

The Breitling Premier Automatic A37340351B1X1 is a 40 mm stainless steel dress watch from the line that returns the Grenchen manufacture to its 1940s roots. It features the Breitling Caliber 37 automatic movement with hours, minutes, small seconds at 6 o'clock, and date display. The case has a satined finish on the sides and polished on the bevels, with tapered lugs ending at 20 mm lug width. The asymmetrical dial design with off-center small seconds recalls vintage pocket watch aesthetics while maintaining modern precision.

FAQ

What is the lug width of the Breitling Premier A37340351B1X1?

The lug width of the Breitling Premier A37340351B1X1 is 20 mm. This measurement should be taken internally between the two lugs using a digital calliper, at rest and without applying pressure to the steel, to ensure correct compatibility with any aftermarket strap.

What is the best strap for the Breitling Premier A37340351B1X1?

For the Premier A37340351B1X1 in brushed stainless steel, the most suitable materials are square-scaled alligator for formal settings, shell cordovan for intensive daily wear that develops a natural patina over time, and vegetable-tanned calf leather for a balance between elegance and durability. A brushed steel deployant clasp completes the pairing both functionally and aesthetically.

How do I change the strap on the Breitling Premier A37340351B1X1?

To replace the strap on the Breitling Premier A37340351B1X1, use a fine-tipped or lever-style spring bar tool, inserting it into the spring bar slot on the inner side of the lug. Compress the spring bar, remove the strap, and insert the new one by reversing the process. It is advisable to work on a soft surface to avoid scratching the brushed case.

Are there aftermarket straps compatible with the Breitling Premier A37340351B1X1?

Yes, any strap with a 20 mm lug width is technically compatible with the Breitling Premier A37340351B1X1, provided the spring bar is standard gauge (1.5 mm diameter). On milanostraps.it you will find a range of handcrafted 20 mm straps in various materials and finishes, compatible with this reference and made to order by Casati Milano atelier.

How long does a leather strap last on the Breitling Premier A37340351B1X1?

The lifespan of a leather strap depends on the material and frequency of use. A quality shell cordovan or alligator strap with vegetable tanning and hand-burnished edges can last between 3 and 7 years with moderate daily wear. Calf leather has a shorter average life of 1 to 3 years. Factors such as perspiration, water exposure and storage conditions significantly affect longevity. Casati Milano offers an 18-month guarantee against manufacturing defects.