I have a DG2813 with a modified date position. I am trying to remove it. Anyone got a clue on how to do this? There is a "retaining E washer" which I already removed at the center. I expected the date wheel to come loose with this, but it doesn't (I tried to apply some force on it).
If you google "DG2813 modified date" then you will find a movement which has holes in the modified date disk. But mine does not have that. See photo.
Edit: The movement might be a Beijing SB11 movement, as there is a "B" under the balance. A very similar movement to the DG2813.