By the end of the lugged steel era, there were several USA made frames that are arguably better than 98% of Italian frames of that era, but if you must have Italian to go with your Campy stuff, I get it.
Yamaguchi, Gangl, Columbine, Eisentraut, RRB, just to name a very few. You could argue that a lot of Serottas and Waterfords are superior, also.
I even once owned an early lugged steel Moots that rode as well and had every bit as good a finish as my brother's Master Light.
Speaking of which, you can still get a lugged steel, 1" head tube, totally custom frame/fork for $2000 and up. I'd get a new custom before paying anywhere near that much for an older frame.
If I was looking for an authentic retro, I'd get an old USA frame or a Carlton 753 Raleigh. I saw too many Italian frames back in the day that were misaligned, poorly done, and with brittle paint. I used to see a lot of Italian frames that buckled in a crash where the downtube shifters went, or just behind the lugs. Both of these issues are due to overheating the joint during brazing. I actually bought a rideable mid-70s Colnago Super a few years ago that had a very slight buckle on the underside of the TT just behind the top lug. I wanted the components, which included a pantographed Super Record crank and a SR headset in good shape. I ended up just riding it a bit and then selling it off for what I bought it for.
