5402ST late numbers without letter

Royal Oak Jumbo 5402 — 5402ST late numbers without letter

1988–1990

The last steel 5402s carry a small number without letter, continuing the 5402SA numbering. A dial completed after about 1985 would read “SWISS MADE”.

21 sold: 5 (1988), 10 (1989), 6 (1990).

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Identifying details

Octagonal bezel
Eight-sided bezel around a round dial opening.
Integrated bracelet
Metal bracelet designed as one with the case.
Date
Date display.

Variants of 5402

Reference overview →

Switch between variants of this reference. The current variant is highlighted.
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: 1988–1990
Case material: Stainless steel
Case diameter: 39 mm
Water resistance: 100 m
Crystal: Sapphire
Movement: Automatic
Date: Yes

More specifications (1)

Caliber

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