On the frame BY where the shackle would be, right side front spring. That's where both my earlier DBs are. Numbers are very lightly stamped, maybe 1/2 high. If you can't find it PM me I will check it with a friend to be postive.
My 30 DD #s are on the DRIVERS (left ) side of the frame, just above the rear spring hanger for the FRONT spring... FYI the front hanger is @ the very front end of the frame.. The hanger in question here is about 48" back... They are about 1/2" tall and should begin with the model ( DD or DB etc..) Dave
I just went out and looked at my 33. Couldn't find it anywhere. I can't imagine there is that much paint covering them but there could be.