Audemars Piguet Royal Oak Selfwinding · Reference 15400ST
Audemars Piguet Royal Oak Selfwinding 15400ST
Known as The 41mm Royal Oak, the one that took the collection from 39mm to full-size
The 15400ST is the time-and-date Royal Oak that most collectors picture when they hear the name. Audemars Piguet launched it in 2012 to replace the 39mm 15300, pushing the steel Jumbo-descendant case to 41mm and running it until 2019, when the 15500ST took over. Full stainless steel, integrated bracelet, tapisserie dial, sapphire caseback showing the automatic movement. This is the reference that defined the modern Royal Oak look for seven years, and it is the one that comes across our counter on 47th Street more than any other steel AP. If you want the classic octagonal bezel with eight hex screws, the tapered links, and a dial you can stare at for an hour, this is the entry point into serious Royal Oak collecting.
Produced: 2012 to 2019
In stock at Ultimate Diamond
3 pieces on the counter right now.
Specifications
- Reference
- 15400ST.OO.1220ST
- Case Diameter
- 41mm
- Case Thickness
- 9.8mm
- Case Material
- Stainless steel
- Bezel
- Octagonal steel bezel secured by eight white gold hexagonal screws
- Dial
- Grande Tapisserie pattern with applied white gold hour markers and Royal Oak hands, double baton index at 12 o'clock with AP logo beneath, date window at 3 o'clock
- Dial Colors
- Blue, black, white, and slate on the steel version
- Crystal
- Sapphire, with a sapphire display caseback
- Movement
- Automatic, in-house Calibre 3120
- Power Reserve
- 60 hours
- Frequency
- 21,600 vibrations per hour (3 Hz)
- Jewels
- 40 jewels
- Functions
- Hours, minutes, center seconds, date
- Water Resistance
- 50 meters
- Bracelet
- Integrated stainless steel Royal Oak bracelet with AP folding clasp
Market & Value
The 15400ST trades in a well-established band on the secondary market. As of mid-2026, clean steel examples generally sit in the mid-30s, with WatchCharts tracking the model around 34,000 dollars, and condition, dial color, and completeness moving individual pieces up or down inside roughly the low-30s to high-40s range. Blue dials and full sets with box and papers carry a premium; slate and white dials tend to be more available. Because the reference is discontinued, supply is fixed and does not grow, which is why the floor has held even through softer periods in the steel-sport market. The 15400ST also lives directly under the 15500ST that replaced it, so buyers cross-shop the two constantly. The 15500 brought the Calibre 4302 with a 70-hour reserve and a printed minute track pushed to the outer edge of the dial. Plenty of collectors prefer the cleaner, more integrated dial layout of the 15400, and that preference keeps demand real. We buy these every week, so we price off what is actually clearing, not off a chart from last quarter.
What to Know Before You Buy
Three things separate a strong 15400ST from an average one. First, the dial layout: the 15400 keeps the minute track tucked in tight against the tapisserie field, a look that reads more classic than the 15500 that followed it, and dial color drives value more than most people expect, with blue at the top. Second, the case: at 41mm and 9.8mm thick, this wears larger than the 39mm 15300 it replaced, so if you are coming off a smaller Royal Oak, try it on the wrist before you commit. Third, and most important on the buy side, is the finishing. The Royal Oak lives and dies by its brushed and polished surfaces, and a heavily polished case that has lost its crisp bevels is worth meaningfully less than one with sharp, factory-correct edges. Check the eight hexagonal bezel screws for alignment, confirm the date wheel spacing and the double index at 12, and make sure the movement matches a genuine Calibre 3120 through the sapphire back. Box, papers, and an unpolished case are the combination that commands the top of the range.
Buying or selling a Audemars Piguet Royal Oak Selfwinding 15400ST?
Ultimate Watch buys and sells the Royal Oak 15400ST at our counter at 19 West 47th Street in New York, family-owned since 1959. We handle steel Royal Oaks constantly, so we can tell you within minutes whether a case has been over-polished, whether the dial and hands are correct, and what your specific reference and color are actually worth today. If you are buying, we can source the dial variant you want in the condition you want. If you are selling or trading, bring it in for a same-day cash offer, or call us and send photos of the case, dial, and caseback and we will give you a number before you make the trip.