Strap for Transocean Day & Date Stainless Steel / Black / Calf / Pin

The lug width of the Breitling Transocean A4531012/BB69/105X/A20BA.1 is 22mm. This measurement is taken between the two lugs at the point where the strap attaches to the case. For accuracy, a millimetre calliper is recommended rather than measuring the original strap width.

Given the Transocean's dress-chrono character and 43mm stainless steel case, a belly-cut alligator strap with a deployant clasp is the most fitting choice. Vegetable-tanned calf leather offers a developing patina and natural anatomical break-in over time. For mixed formal and active use, vulcanised rubber maintains clean aesthetics alongside moisture resistance.

The strap is removed using a flat-tipped or forked spring bar tool, applying gentle leverage against the spring bar that connects each strap half to the lug. It is advisable to work on a soft surface to protect the case's polished and brushed finishes. Strap changes do not require professional equipment, though care and steady hands are recommended to avoid scratching.

Yes. Any strap with a 22mm lug width and standard length (75/115mm or 75/120mm for average wrists) is technically compatible. Milano Straps offers a curated selection of handcrafted 22mm straps in alligator, calf leather, NATO and rubber, each crafted with selected materials and hand-finished to suit this Breitling reference.

Longevity depends on leather quality, tanning method, and conditions of use. A vegetable-tanned alligator strap, kept dry and stored correctly, can last between three and seven years with daily wear. Calf leather is more susceptible to perspiration and humidity. Regular strap replacement is also a form of aesthetic maintenance that keeps a timepiece of this calibre looking its finest.