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
ReferenceR4531012/BB70/737P/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 R4531012/BB70/737P/R20BA.1

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Transocean R4531012/BB70/737P/R20BA.1, seen from the bench

The Breitling Transocean R4531012/BB70/737P/R20BA.1 features a 43mm 18K red gold case with a 22mm lug width and houses the in-house Breitling Calibre 45 movement, COSC-certified chronometer. The watch displays hours, minutes, seconds, day, and date functions, embodying a dressy-sport aesthetic designed for both aviation cabins and formal settings. The red gold case interacts with light in warm, copper-toned hues that enhance dial depth and case details.

Frequently asked questions

What is the lug width of the Breitling Transocean R4531012/BB70/737P/R20BA.1?

The lug width of the Breitling Transocean R4531012/BB70/737P/R20BA.1 is 22mm. This measurement should be taken with a digital calliper inside the lug gap, at the point where the strap seats against the case.

What is the best strap for the Breitling Transocean R4531012/BB70/737P/R20BA.1 in red gold?

For an 18-carat red gold case such as that of the Transocean, an alligator strap with vegetable tanning offers the most coherent aesthetic and material pairing. The glossy belly grain interacts with the warm reflections of the alloy, while cognac, toasted honey or bordeaux shades enhance the chromatic specificity of red gold. A red gold deployant clasp completes the combination with material continuity.

How do I change the strap on a Breitling Transocean R4531012/BB70/737P/R20BA.1?

Strap replacement requires a fine-tipped spring bar tool. Insert the tip into the lug notch, compress the spring bar lug and slide the strap out laterally. Always place the watch face-down on a soft cloth to avoid scratching the red gold case. For first-time replacements on precious metal cases, it is advisable to consult a watchmaker.

Are there aftermarket straps compatible with the Breitling Transocean R4531012/BB70/737P/R20BA.1?

Yes. Any strap with a 22mm attachment is compatible with the Breitling Transocean R4531012/BB70/737P/R20BA.1, provided the end profile fits the lug gap correctly. At milanostraps.it you will find a curated selection of 22mm handcrafted straps in leather, alligator and other materials, available bespoke or ready to ship.

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

Longevity depends on tanning quality, frequency of use and maintenance. A superior vegetable-tanned alligator strap, rotated with at least one other strap and periodically treated with neutral leather conditioner, can retain its structural and aesthetic integrity for 3 to 5 years. Continuous exposure to perspiration, water and UV radiation significantly reduces the serviceable life of any leather, regardless of price point.

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