5402BA (yellow gold)
Royal Oak Jumbo 5402 — 5402BA (yellow gold)
Solid 18k gold case and bracelet, with small numbers 1–745 and no letter. Usually a blue dial with yellow-gold markers; date discs usually gilt. Early bracelets had a yellow-gold folding clasp, soon replaced by a stiffer white-gold one. The first, no. 4 (case B12753), was flown to Japan on 8 June 1977.
736 sold 1977–1990 (231 in 1978), including 9 converted to the gem-set 4187BA between 1980 and 1985.
Identifying details
Variants of 5402
Reference overview →| Variant | Production |
|---|---|
| 5402ST A-Series | 1972–c. 1976 |
| 5402ST A-Series · Steel bezel screws (earliest examples) | c. 1972 |
| 5402ST without small number (Intermediate series) | 1974–c. 1976 |
| 5402ST B-Series | 1975–c. 1977 |
Case & movement
- Reference
- 5402
- Production
- 1977–c. 1990
- Case serials
- c. 1–745
- Case material
- 18k yellow gold
- Case diameter
- 39 mm
- Water resistance
- 100 m
- Crystal
- Sapphire
- Movement
- Automatic
More specifications (2)
- Date
Movement
Audemars Piguet 2121
Date version of the 2120, introduced in October 1970 in model 5381 and chosen for the first Royal Oak in 1972; at the time the thinnest automatic with central rotor and date. Ébauche from LeCoultre & Cie until about 2002, then made by AP; replaced by the 7121 in 2022.
Automatic · Introduced 1970 · 19,800 vph · 36 jewels · 40 h reserve · Ø 28 mm · 3.05 mm thick