I think the dropouts were swapped: Campy Portacatena shorties for the original Campy longboys...no idea why this would have been necessary (and could have been for "fashion" I suppose) but the rest of the frame does not look like a match to the "early '80s" DOs, more like this frame/fork is vintage 1972 as suspected EXCEPT there were also WB bosses added, maybe when the DOs were replaced. Do the shifter bosses seem OEM?

Also note the nutted brakes and "whale-tail" Nervex Pro headlugs, plus what I think are the OEM top-of-BB cable guides but NOW the cables are running UNDER the BB, this has been "updated" sometime after about 1978.