Home / OCTA Factory: which Royal Oak references use cal. 4302?
OCTA Factory
OCTA Factory: which Royal Oak references use cal. 4302?
Two Royal Oak references on this site carry the cal. 4302: the 15500ST and the 15510ST, the 41mm octagonal case in seven dial builds. This page sets out what we can state about that movement, what we cannot, and how you check the one in your watch.
Short answer: The cal. 4302 in the 15500ST and 15510ST is an integrated clone built by the Dandong movement factory, listed in our catalogue as DD4302, with a free-sprung balance and eight weight screws. It is a time and date movement: hours, minutes, centre seconds and a date at 3. Seven builds across the two references are priced on this site, all at $1,110. We publish no power reserve, no beat rate and no jewel count for it, because those figures have not been given to us in writing.
Checked on 2026-10-26
Which references carry the cal. 4302?
Two: the 15500ST and the 15510ST. The 15500ST is the earlier 41mm reference and the 15510ST is the current one; the difference between them is the dial furniture and the case proportions, not the movement recorded against them. Our catalogue lists the same integrated cal. 4302 clone for both. Between them they carry seven builds on this site, in blue, black, khaki green, grey and silver Tapisserie dials, all at $1,110 because the workshop charges the same for the reference whatever the dial. The 15400 and the 15450 are also Royal Oak cases, in 41mm and 37mm, but our catalogue records no movement against either, so this site assigns them none. If you are weighing the 15500ST against the 15510ST, the choice is a case generation and a dial, not a different calibre.
What does a free-sprung balance with eight weight screws mean?
A free-sprung balance has no regulator index arm over it. Instead of a lever that drags on the hairspring, the rate is set by small weights set into the rim of the balance wheel, and that is what the eight screws are: the points where the rate is adjusted. In watchmaking generally this is the arrangement used where the maker wants fine adjustment without a regulator touching the spring. It is the description the workshop gives for this movement and the description we repeat here. We can repeat it, we cannot measure it, and we do not present it as a performance claim: no timing certificate comes with the watch and none is implied.
What we can and cannot tell you about this movement
What we can state is short and comes from our own records: it is an integrated clone, it is built by the Dandong movement factory, it is catalogued as DD4302, it has a free-sprung balance with eight weight screws, and it drives hours, minutes, centre seconds and a date. What we cannot state is everything else people normally ask: the power reserve in hours, the frequency in vibrations per hour, the number of jewels, the finishing standard, the position tolerances, and whether any part of it is interchangeable with the reference movement. Those numbers exist somewhere, but nobody has given them to us in writing, and a wrong figure on a page is worse than a missing one. Ask on the order thread and whatever the workshop confirms goes to you in the reply, not into a marketing line.
How do you check the movement in the watch you receive?
The movement is one of the things photographed after payment. Once the figure is settled, the watch bought for your order is opened and photographed, caseback and movement included, and the set reaches you within one to two days with your order number on it. You look at those frames before anything is dispatched, and if the movement in the photographs is not what you expected, say so, because that is the point of the step. If a watch cannot be supplied that you are happy with, the payment is refunded. Each movement carries a two-year warranty, returns run fourteen days in unchanged condition, and shipping is a flat $50, tracked, to every country except Brazil.
Is the cal. 4302 an Audemars Piguet movement?
No. It is a clone built to the same layout by the Dandong movement factory, recorded in our catalogue as DD4302. Nothing on this site claims that any watch here is an Audemars Piguet watch, or that it has any connection to the brand.
Do the 15500ST and the 15510ST use the same movement?
Yes. Our catalogue records the same integrated cal. 4302 clone against both references. What changed between the two generations is the case and the dial, not the movement.
Can I see the movement before I pay?
No. The photographs are of the watch bought for your order, so they are taken after the payment is confirmed. Before you pay you have the reference, the dial, the published price and the movement description on this page.
Where these references live on this site
Brand names and reference numbers are used for identification and comparison only; all trademarks belong to their respective owners. We sell replica watches built by independent factories and describe them as such - we make no claim of authenticity, authorisation or affiliation with any watch brand or trademark owner.