My car was built in May 1986 and wasn't Cuprinol dipped. It did have wing beading fitted, but was originally painted with the wings on so the beading was painted over.
That is a new one on me. Mike Duncan told me that our 1st Morgan (1985 4/4) had been ordered with wing beading so that it was painted wings off. The beading did not have paint on it. However, by the time we got the car at 18 years old, it had been re-painted so no way of knowing.
