Technical Archive

Breitling
Transocean A1631012/BD15/171A— lug 20mm

Breitling Transocean A1631012/BD15/171A: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Transocean 38 Stainless Steel / Black / Bracelet

Artisanal Note

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

Technical Specifications

Breitling A1631012/BD15/171A
Lug Width
20 mm

The essential strap measurement.

Browse 20mm straps →
Reference

A1631012/BD15/171A

Movement

Breitling caliber Caliber B16 Hours, Minutes, Small Seconds | Big Date

The Heritage

The Transocean is equipped with the Breitling B16 automatic caliber with functions for hours, minutes, small seconds and large date. The case features 20mm lugs. The movement provides essential time indications with the complication of the large date.

FAQ

What is the lug width of the Breitling Transocean A1631012/BD15/171A?

The Breitling Transocean A1631012/BD15/171A features a lug width of 20mm. This measurement refers to the internal distance between the two lugs at the strap attachment point. It is advisable to verify this figure on the physical watch using a calliper, as bracelet variants may differ slightly in their lug geometry.

What is the best strap for the Breitling Transocean A1631012/BD15/171A?

For a 38mm dress-sport case, an alligator hornback or shell cordovan strap offers the most coherent aesthetic pairing. Both materials develop an authentic patina over time and complement the Transocean's dual formal and avionic character. A vegetable-tanned calf leather strap is the recommended choice for intensive daily use.

How do you change the strap on a Breitling Transocean A1631012/BD15/171A?

Strap replacement is carried out via the spring bars connecting the strap to the case lugs. Using a spring bar tool or a fine-tipped opener, compress the spring bars and slide the strap free. The operation takes approximately two minutes and requires no professional tools, though it is advisable to work on a soft surface to protect the case from scratching.

Are there aftermarket straps compatible with the Breitling Transocean A1631012/BD15/171A?

Yes. Any strap with a 20mm lug width is technically compatible with the Breitling Transocean A1631012/BD15/171A. Milanostraps.it offers a curated selection of artisan straps in various materials, tapers, and finishes, proportioned specifically for 38mm cases, with bespoke customisation available through the Casati Milano atelier.

How long does a leather strap last on a Breitling Transocean?

Longevity depends on material and frequency of use. A standard calf leather strap typically lasts 12 to 18 months with daily wear. A top-grade alligator or shell cordovan strap, owing to the density of the hide fibres, can last 3 to 5 years while retaining its shape. Regular conditioning and rotating between multiple straps will significantly extend the leather's service life.