Audemars Piguet Royal Oak “Jumbo” 5402BA (1979)

Conceived by Gérald Genta and unveiled in 1972, the Royal Oak rewrote modern watchmaking by elevating the “sports watch” into the realm of high luxury through its octagonal bezel with visible screws, integrated bracelet, and radical finishing philosophy. When Audemars Piguet introduced precious-metal executions in the late 1970s, the yellow-gold 5402BA became one of the most coveted expressions of the original “Jumbo” concept—an early, era-defining reference that pairs landmark design with uncompromising craftsmanship.

This 1979 Royal Oak ref. 5402BA (“BA” denoting 18kt yellow gold) is part of an estimated production of approximately 736 pieces made between 1977 and 1990, a figure that underscores its scarcity within the first-generation line. The 39 mm case and integrated bracelet preserve the model’s famously balanced proportions, while the caseback engraving remains crisp and legible. Its “Petite Tapisserie” dial presents a light tropicalization that collectors prize for its honest, time-earned character, complemented by 11 brilliant-cut diamond hour markers, the applied AP signature at 12, and the discreet date at 3.

Powered by the ultra-thin automatic calibre 2121-1—one of the great high-end movements of its era—the 5402BA sits at the intersection of design history, mechanical pedigree, and long-term collectability. Within the market, first-generation Royal Oak “Jumbo” examples in precious metal are widely regarded as cornerstone pieces for serious collections, offering blue-chip recognition, limited supply, and enduring cultural relevance across horology, design, and luxury sport.