The short version
A movement designation in this trade has two parts. The number is the calibre being copied — 3285 is the Rolex GMT calibre with the independently settable 24-hour hand. The letters in front name the clone family that produced it. In the trade's usage the DD prefix is read as the Dandong family and SH as the Shanghai family; the two produce GMT-capable calibres and are sold side by side.
You will also see a version suffix — v2, v3 — in forum posts and on some sellers' pages. That is shorthand for a batch revision. We do not publish batch numbers, because we have no way to verify what any particular batch changed, and a revision number we cannot check is worse than no number at all.
What our own record holds
Counted live from our catalogue: 231 references, of which 191 carry a movement designation and 40 do not. Every code below is printed exactly as the product record carries it — no relabelling, no normalising to one spelling.
| Designation | References | Used in |
|---|---|---|
| DD3235 | 53 | Datejust 35 · Yacht-Master 9 · Submariner 7 · Sea-Dweller 2 |
| DD3230 | 28 | Oyster Perpetual 22 · Explorer 3 · Air-King 2 · Submariner 1 |
| DD3285 | 16 | GMT-Master 14 · Explorer 2 |
| DD4131 | 16 | Daytona 16 |
| DD3255 | 16 | Day-Date 16 |
| DD8500 | 13 | Constellation 10 · De Ville 2 · Seamaster 1 |
| DD3135 | 10 | Submariner 10 |
| DD8800 | 10 | De Ville 6 · Seamaster 4 |
| DD8900 | 9 | Constellation 5 · De Ville 3 · Seamaster 1 |
| DD4302 | 7 | Royal Oak 7 |
| DD8806 | 4 | Seamaster 4 |
| DD2500 | 3 | De Ville 2 · Seamaster 1 |
| DD8912 | 2 | Seamaster 2 |
| DD4130 | 1 | Daytona 1 |
| DD4132 | 1 | Daytona 1 |
| VS3230 | 1 | Oyster Perpetual 1 |
| DD8906 | 1 | Seamaster 1 |
Read the letters down that column: every designation in our catalogue is a DD family code, with a single exception recorded as VS3230. There is no SH3285 here, and no VR designation either. That is not a judgement about those families — it is what our supply records, and we do not invent a designation for a watch to match a search term.
Why that matters more than the letters do
Because the letters are the part of the specification a buyer can be lied to about most easily. The calibre is inside a closed case on almost every one of these builds: you cannot see it, and a seller who writes "SH" in a chat and ships a DD — or the reverse — has changed nothing you can physically check on arrival.
Which is why the useful question is not "which family is better" but "which code is written on the listing, and does everything else agree with it?" Our listings print the code our record holds, and the same record generates the table above. If a seller states one family in a message and another on the page, that inconsistency is the signal worth paying attention to — much more than the family itself.
How to tell which you have
The function set is the practical test, and it does not require opening anything:
- GMT calibres (3285 family) — the fourth hand sets independently in one-hour jumps, and the date quicksets.
- Date calibres (3235, 3135) — quickset date, no independent 24-hour hand.
- Day-date (3255) — sets day and date.
- No-date (3230) — no date position in the crown at all. If a no-date build has a phantom date position, that is the "ghost date" the trade complains about: a date calibre in a no-date watch.
- Chronographs (4131, 4130) — pusher and subdial layout follows the calibre being copied.
That validates the type of movement. It cannot tell you the family that built it, and no honest seller should tell you a wrist test proves one. Where the caseback is display rather than solid, the photographs on the listing show the movement as it is — which is another reason we photograph and film each watch before it ships.
What we do not publish
No reliability ranking between families. No beat rate, power reserve or accuracy figure for any calibre. No batch revision numbers. Each of those would be a claim we cannot back with our own measurement, and the absence is deliberate rather than an oversight — the reasoning is set out on the movement guide, where every designation is also mapped to the references that use it.
What you can check here: the code on any listing, the table of every code in the catalogue, and the 40 references where the record carries no designation at all — printed as blank rather than guessed, including Panerai (39), Omega (1).
The GMT question, in one line
Our catalogue holds 14 GMT-Master references, and every one of them is recorded as the DD3285 — plus two Explorer II references on the same calibre. If you want the GMT function set and you want the designation written down before you pay, that is where to look: the GMT-Master range is here.
Questions buyers ask about movement codes
Straight answers, no filler.
Is SH3285 the same as DD3285?
No. They are two naming families used in the trade for clone calibres, and both are described as GMT-capable. The number is the same because both are built to copy the same original: Rolex calibre 3285. The letters are what differ, and they indicate which family built the calibre.
Which one is better?
We do not rank clone calibres, because we have no verified failure dataset and a ranking without one is marketing rather than information. What we can tell you is which designation our product record holds for each listing, and that we print it as it stands instead of converting it to whichever spelling is more fashionable.
Does my Submariner have a 3285?
No. The 3285 is the GMT calibre — the one that drives a fourth, independently settable 24-hour hand. In our catalogue the GMT-Master references are recorded as the 3285, while the Submariners are recorded as the 3235 or the 3135, the Datejust as the 3235, the Day-Date as the 3255 and the no-date models as the 3230.
What does the number in the code mean?
It is the calibre the movement is built to copy, not a rating or a version: 3235 for the current no-complication Rolex calibre, 3255 for the Day-Date, 3285 for the GMT, 4131 and 4130 for the chronographs, 3230 for the no-date calibre, and 8500, 8800, 8900 for the Omega calibres in the catalogue.
Can I see which movement my watch has?
Only on references with a display caseback. Most of these builds are solid-backed, so the calibre is not a visible part of the watch you receive — it is what the product record states. That is exactly why the listing prints it: so the claim is written down before you buy, rather than told to you afterwards.
Why do some listings state no movement at all?
Because the product record for those references does not carry one. 40 of our 231 references are in that position — almost all of them Panerai. They state nothing rather than a guess, and this page states nothing on their behalf either.
Browse the VS Factory catalogue
Every reference is listed with its factory line, reference number and movement — and shipped only after you approve the QC photos of your own watch.
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