5402ST without small number (Intermediate series)
Royal Oak Jumbo Intermediate series 5402 — 5402ST without small number (Intermediate series)
1974–c. 1976
Made while AP hesitated over the model’s future at the end of 1974: the caseback has no small number at all. Sits between the A and B series.
129 sold, 90% of them between January and September 1975 (1 in 1974, 120 in 1975, the rest scattered to 1994). A 1975 example with archive extract has an AP-at-6 dial.
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)Current | 1974–c. 1976 |
| 5402ST B-Series | 1975–c. 1977 |
Case & movement
- Reference
- 5402
- Production
- 1974–c. 1976
- Case serials
- Case material
- Stainless steel
- 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