Many modern Omega crowns do not disengage when they are being screwed down. I don't have a PO Chronograph in the shop to check, but my guess is that it does not disengage when the crown is being screwed down, so this is normal.
Often if the watch is new the seals are tight on the case tube, and this makes turning the crown more difficult. The 3313 itself is not difficult to wind, so this is like an issue with the case parts rather than the movement.
Cheers, Al
Click to expand...