Audemars Piguet Royal Oak 15407 Double Balance Wheel Openworked
The Audemars Piguet Royal Oak 15407 is the 41 mm Double Balance Wheel Openworked, the watch that introduced Audemars Piguet’s patented double balance wheel in 2016. Inside is calibre 3132, a self-winding movement with two balance wheels and two balance springs on the same axis, openworked so that the whole mechanism shows through the front and through the sapphire case back. The 15407 has been made in stainless steel, 18-carat pink gold, 18-carat yellow gold and hammered 18-carat white gold.
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How the Double Balance Wheel Works
A mechanical watch keeps time through its balance wheel and balance spring, the regulating organ that swings back and forth at a fixed rate. How steady that organ stays decides how precisely the watch runs, and the way the watch is held on the wrist can disturb it. In the 15407, Audemars Piguet fixes a second balance wheel and balance spring on the same axis as the first, so the two work as a single regulating organ. The brand credits the patented geometry with a clear gain in precision and stability, at the cost of a far more complex manufacturing process.
Calibre 3132 is built from 245 parts and 38 jewels. It beats at 3 Hz, or 21,600 vibrations an hour, and holds a power reserve of 45 hours. There is no solid dial: the hour-markers sit on an inner bezel around the openworked movement, and the double balance can be seen from the front of the watch and through the case back.
Every 15407 Version
Audemars Piguet has made the 15407 in four metals. The steel watch exists in two versions, and the white gold watch is the hammered Frosted Gold edition. Every version is 41 mm, 9.9 mm thick in steel and 10.1 mm in gold.
| Reference | Case and movement finish |
| 15407ST.OO.1220ST.01 | Stainless steel case and bracelet. Slate grey openworked movement, pink gold hour-markers |
| 15407ST.OO.1220ST.02 | Stainless steel case and bracelet. Pink gold-toned movement and inner bezel, white gold hour-markers, pink gold screws on the bezel |
| 15407OR.OO.1220OR.01 | 18-carat pink gold case and bracelet. Slate grey openworked movement, pink gold hour-markers |
| 15407BA.OO.1220BA.01 | 18-carat yellow gold case and bracelet. Blackened movement and inner bezel, yellow gold hour-markers |
| 15407BC.GG.1224BC.01 | Hammered 18-carat white gold case and bracelet (Frosted Gold). Slate grey openworked movement, pink gold hour-markers |
The two steel versions are the easiest to confuse, and the suffix is what tells them apart. The .01 pairs the steel case with a slate grey movement, so the watch reads in one colour with pink gold accents. The .02 turns the movement and the inner bezel pink gold-toned and adds pink gold screws on the bezel, which Audemars Piguet presents as a two-tone look.
How to Read a 15407 Reference
The full reference spells out what the watch is made of. Reading 15407ST.OO.1220ST.02 from left to right:
| Segment | In this example | What it tells you |
| Model | 15407 | Royal Oak Double Balance Wheel Openworked, 41 mm, calibre 3132 |
| Case metal | ST | ST steel · OR pink gold · BA yellow gold · BC white gold |
| Execution | OO | The standard execution; the Frosted Gold version reads GG |
| Bracelet | 1220ST | The 1220 bracelet in the case metal; the Frosted Gold version has the hammered 1224 |
| Version | .02 | In steel, .01 is the slate grey movement and .02 the pink gold-toned one |
Read the whole reference before you compare two watches: “15407ST” on its own does not say whether the watch is the .01 or the .02.
Audemars Piguet Royal Oak 15407 Price
At Watch My Diamonds, Audemars Piguet Royal Oak 15407 watches range from $198,000 to $225,000 across 3 priced listings.
Royal Oak 15407 Specifications
| Reference | 15407, in stainless steel, 18-carat pink gold, 18-carat yellow gold and 18-carat white gold |
| Case | 41 mm; 9.9 mm thick in steel, 10.1 mm in gold |
| Crystal | Glareproofed sapphire, front and case back |
| Water resistance | 50 m |
| Movement | Calibre 3132, self-winding, openworked, double balance wheel |
| Movement size | 26.6 mm diameter, 4.4 mm thick |
| Parts and jewels | 245 parts, 38 jewels |
| Frequency | 3 Hz, 21,600 vibrations an hour |
| Power reserve | 45 hours |
| Functions | Hours, minutes, centre seconds |
| Bracelet | In the case metal, with AP folding clasp |
FAQs
When was the Royal Oak 15407 introduced?
In 2016. The 41 mm Royal Oak Double Balance Wheel Openworked was the watch that introduced Audemars Piguet’s patented double balance wheel.
What movement is in the AP 15407?
Calibre 3132, a self-winding, openworked movement with two balance wheels and two balance springs on the same axis. It has 245 parts and 38 jewels, beats at 3 Hz and holds a 45-hour power reserve.
What is the difference between the 15407ST.OO.1220ST.01 and the .02?
Both are 41 mm stainless steel. The .01 has a slate grey openworked movement with pink gold hour-markers. The .02 has a pink gold-toned movement and inner bezel, white gold hour-markers and pink gold screws on the bezel.
What is the difference between the AP 15407 and the 15467?
The size. The 15407 is 41 mm and the 15467 is 37 mm, and both use calibre 3132 with the double balance wheel.
How thick is the Royal Oak 15407, and is it water resistant?
The case is 9.9 mm thick in steel and 10.1 mm in gold, with sapphire crystal on both sides, and it is water resistant to 50 m.