Breitling
Calibre B21
Automatic chronograph
Specifications
- Maker
- Breitling
- Type
- Automatic chronograph
- In-house
- Yes
- Power reserve
- about 55 h
- Frequency
- 28,800 vph (4 Hz)
Sources
- Official Breitling retrieved October 19, 2026
Used in
| Watch | Ø | Thickness | Lug-to-lug |
|---|---|---|---|
| Breitling Premier B21 Chronograph Tourbillon 42 Gaston Breitling JB2120A61B1P1 | 42 mm | 15.25 mm | — |
| Breitling Premier B21 Chronograph Tourbillon 42 Willy Breitling LB2120171C1P1 | 42 mm | 15.25 mm | — |
| Breitling Premier B21 Chronograph Tourbillon 42 Léon Breitling RB2120211G1P1 | 42 mm | 15.25 mm | — |
| Breitling Top Time B21 Ford Mustang NB21251A1L1X1 | 42 mm | 15.4 mm | — |
| Breitling Top Time B21 SB21251A1C1X1 | 42 mm | 15.4 mm | — |