Breitling · Transocean

Strap for Transocean Day & Date Red Gold / Black / Croco / Pin

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
ReferenceR45310121B1P1 (aka: R4531012/BB70/743P/R20BA.1)
FamilyTransocean
MovementBreitling caliber Caliber 45 Hours, Minutes, Seconds | Date, Day | Chronometer
CaseRed Gold

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Transocean R45310121B1P1 (aka: R4531012/BB70/743P/R20BA.1)

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Transocean R45310121B1P1 (aka: R4531012/BB70/743P/R20BA.1), seen from the bench

The Transocean is powered by the Breitling 45 caliber with chronometer certification and indication of hours, minutes, seconds, date and day. The model has 22mm lug size for the strap. The reference R45310121B1P1 identifies this specific version of the Transocean collection.

Frequently asked questions

What is the lug width of the Breitling Transocean R45310121B1P1?

The Breitling Transocean R45310121B1P1 has a lug width of 22 mm. This measurement is taken directly between the two lugs using a digital calliper, and is the critical parameter for selecting a compatible strap without lateral play.

What is the best strap for the Breitling Transocean R45310121B1P1?

For the Transocean in 18kt red gold, an alligator strap with vegetable tanning in tobacco, cognac or bordeaux tones is the most coherent choice for the watch's formal register. Tuscan calf leather develops a patina over time that harmonises with the warm hues of red gold. A red gold deployant clasp completes the pairing with maximum aesthetic consistency.

How do I change the strap on the Breitling Transocean R45310121B1P1?

The strap is removed using a fine-tipped spring bar tool inserted into the gap between the lug and the spring bar. The Transocean uses standard 22 mm spring bars. No specialist tools are required, but care must be taken to avoid scratching the red gold case: a microfibre cushion and a coated-tip tool are recommended.

Are there aftermarket straps compatible with the Breitling Transocean R45310121B1P1?

Yes. Any strap with a 22 mm attachment and standard spring bars is technically compatible. milanostraps.it offers a curated selection of handcrafted 22 mm straps made specifically for this format, with materials and finishes befitting a red gold case. Compatibility is guaranteed on lug width.

How long does a leather strap last on a Breitling Transocean R45310121B1P1?

Durability depends on the material and care. A quality alligator strap, treated periodically with nourishing cream and stored away from humidity and direct light, will last between 3 and 5 years with daily wear. Vegetable-tanned Tuscan calf develops a patina more rapidly but has a similar lifespan. milanostraps.it handcrafted straps carry an 18-month warranty against manufacturing defects.

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