Breitling
Breitling Chronomat B01 42 RB0134721G1S2
The Breitling Chronomat B01 42 (reference RB0134721G1S2) is a 42 mm red gold watch with a silver dial. It runs on the automatic caliber B01.
Specifications
Case
- Reference
- RB0134721G1S2
- Collection
- Chronomat
- Case size
- 42 mm
- Case material
- Red gold
- Bracelet / strap
- Rubber strap
Dial and bezel
- Dial
- Silver
Movement
- Movement
- Automatic
- Caliber
- B01
Dial versions
This reference was made with these dials and finishes.
RB0134721G1S2 Silver
RB0134721G1S2
Silver · Diamond (position and count not stated by source)
How it compares within the Chronomat family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| RB0134721G1S2 (This watch) | 42 mm | Red gold | Silver | B01 | — |
| A10380 | 36 mm | Stainless steel | — | 10 | 2020– |
| A17356 | 38 mm | Stainless steel | Ice Blue / Pink / White | 17 | 2021– |
| A32398 | 40 mm | Stainless steel | — | 32 | 2021– |
| A77310 | 32 mm | Stainless steel | — | 77 | 2020– |
| AB0134 | 42 mm | Stainless steel | — | B01 | 2020– |
| AB0136 | 44 mm | Stainless steel | Black / Blue / Green / Anthracite | B01 | 2021– |
| AB0158 | 42 mm | Stainless steel | — | B01 | 2026– |
| AB3114 | 40 mm | Stainless steel | — | B31 | — |
About the Chronomat family
The Chronomat name first appeared on a 1940s Breitling chronograph with a slide-rule bezel. The modern Chronomat was introduced in 1984, with rider tabs on the bezel, and became the brand's main sports chronograph. In 2009 it was the first watch to carry Breitling's in-house caliber B01.
The 2020 generation brought back the Rouleaux bracelet with its rounded links. The catalog lists more than two hundred references, including chronographs, three-hand automatics, GMTs and smaller models, in steel, red gold, Blacksteel and two-tone. Dealers identify the generation, size and caliber from the reference and check the bracelet.
Quick answers
- What size is the Breitling Chronomat B01 42 RB0134721G1S2?
- The Breitling Chronomat B01 42 RB0134721G1S2 has a 42 mm case.
- What movement does the Breitling Chronomat B01 42 RB0134721G1S2 use?
- It uses the automatic caliber B01.
- What is the Breitling Chronomat B01 42 RB0134721G1S2 made of?
- The case is red gold. Bracelet or strap: Rubber strap.
Catalog facts checked October 2026.