Rolex calibres 3230, 3235, 3285, 3255 and 4131: which references use which, and what that means for reps

Watches Movements & Tech
1

Question that keeps coming up when reading QC threads: everyone writes “3235” or “3230” as if the numbers explain themselves. Which current Rolex references use which calibre, and does it matter for a rep?

[[PHOTO: Table graphic with five columns, “3230”, “3235”, “3285”, “3255”, “4131”, and the functions of each calibre: time only, date, GMT, day-date, chronograph]]

Editorial summary, not independently verified.

2

The current family, going by Rolex’s own documentation:

  • 3230: no date, centre hours, minutes and seconds. Submariner 124060, Explorer 124270, Oyster Perpetual.
  • 3235: adds the instantaneous date. Datejust 41 126300, Submariner Date 126610LN, Sea-Dweller 126600, Deepsea 136660.
  • 3285: date plus a 24-hour hand and an independently adjustable hour hand. GMT-Master II 126710, Explorer II 226570.
  • 3255: day and date. Day-Date 40 228235.
  • 4131: automatic chronograph. Cosmograph Daytona 126500LN.
    The 32xx calibres are rated at about 70 hours of power reserve, the 4131 at about 72.
3

The reference number itself tells you the family, which helps when you see a calibre named in a listing. How to read the digits and suffixes is in how to read a Rolex reference.

4

So if a rep is sold with a “3235”, is that a Rolex movement?

5

No. On reps those names describe clone movements built to copy the layout and look of the original, not Rolex parts. The differences between the two best-known 3235 clones are in VS3235 vs DD3235, and how a clone compares with an Asian 2824-type base is in clone or Asian 2824.

A Rolex case back is solid, so the movement is never visible on a normal QC photo. What a photo can’t confirm, a listing claim can’t either.

6

One thing you can check by hand is the crown, because the setting positions follow the calibre:

  1. No date (3230): pulled once, the hands are set. No date position.
  2. Date (3235): first pulled position for the quick-set date, second for the time.
  3. GMT (3285): first pulled position moves the local hour hand in one-hour jumps, which also changes the date; second for the time.
    If a watch sold as a GMT has no jumping hour hand, the movement inside doesn’t match the function the dial shows.
7

Worth adding: the functions on the dial are what matter day to day, not the number. A watch without a date window should behave like a no-date calibre at the crown, and one sold as a GMT should have the jumping hour hand. The terms for all this are explained in the watch movements & parts glossary.

8

Summary:

  1. 3230 = no date (Submariner 124060, Explorer 124270, Oyster Perpetual).
  2. 3235 = date (Datejust 41, Submariner Date, Sea-Dweller, Deepsea).
  3. 3285 = GMT with jumping local hour hand (GMT-Master II 126710, Explorer II 226570).
  4. 3255 = day-date (Day-Date 40); 4131 = chronograph (Daytona 126500LN).
  5. On reps the names refer to clone movements, not Rolex parts. The movement isn’t visible on QC photos; the crown positions are a quick functional check.

Editorial summary, not independently verified.

9

That clears it up. The crown-position check is handy, I hadn’t thought of that.