Audemars Piguet 15400ST

Audemars Piguet 15400ST

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History of the Audemars Piguet Royal Oak 15400ST

Royal Oak Origins (1972 →)

The story begins in 1972 when Audemars Piguet launched the first Royal Oak, designed by Gérald Genta. It was revolutionary: an octagonal bezel with exposed screws, an integrated bracelet, and a sporty-luxury steel construction at a time when gold dress watches dominated.
The Royal Oak quickly became AP’s signature line and evolved into multiple sizes and movements over the next decades.

Lead-up to the 15400: The 15300 (2005–2012)

Before the 15400, the main three-hand Royal Oak was the 39 mm 15300, which introduced the in-house Calibre 3120.
This period set the modern template: tapisserie dial, applied indices, sapphire caseback, and a more robust build compared to earlier “Jumbo” models.

Introduction of the 15400ST (2012)

In 2012, AP discontinued the 15300 and introduced the 15400ST, increasing the case size from 39 mm to 41 mm to match contemporary preferences.

Key improvements:

41 mm case (first time for the standard 3-hand Royal Oak)
Slim, modern profile with better wrist presence
Updated dial layout with double-baton index at 12 o’clock
Continued use of the reliable Calibre 3120
A more balanced and symmetrical dial than its predecessor

This version brought a more modern visual experience without compromising the classic Royal Oak DNA

The Blue Dial Variant

The blue-dial 15400ST is the most coveted version of the reference.

Characteristics:

Features AP’s signature “Grande Tapisserie” blue, one of the most recognizable Royal Oak colorways
Often considered rarer or less common than black or silver dials
The blue tone changes depending on light — appearing deep navy indoors but vibrant blue in sunlight
Retains the sporty-elegant balance that makes the Royal Oak visually distinctive

Among collectors, the blue 15400ST is widely considered the “sweet spot” in the modern Royal Oak lineup.