Columbus stamped on steerer tube. Campy rear dropouts with 120 spacing.

Interesting drilled dropouts.

You need to post photos of distinctive features: dropouts, seat lug, fork crown, head lugs.

Well, it's decent quality and probably late 1970s. It'll need more detail pictures for anybody to do any better than that -- good shots of all the lugs/BB/the drilling in the rear DO/fork crown.

I love drillium rear dropouts, they always look so great.

There are more photos posted here that are larger.

https://forums.roadbikereview.com/ret...ld-279538.html

Looks like an old Gios, but maybe is not... 120 mm spacing?? that thing has to be pretty old... 50s or 60's

The brazed-on cable guides at the bottom bracket make me think much newer than 50's or 60's. The brazed-on rear brake cable guides, too, to a lesser extent.

Nice job with the paint and the parts-bin build. How's it ride?

I've posted the pics from the other forum.

I'd say mid to maybe early 70's . The bottle mount and nutted brake bridge pushes it in that time frame for me. When did bottle mounts first start showing over the clamp on style on frames? I don't recall seeing many frames from the 60's with bolt on bottle cages and have even seen Colnagos from the 70's using a clamp on cage.

He posted more photos here:

https://s167.photobucket.com/albums/u...steel%20frame/

Gios is a good guess, but mid to late 70's. Isn't that the seatstay cap Gios used?

Doing some photo searches, the seat cluster and drilled rear dropouts look Gios but not the heart shaped cut-outs and fork crown. Did Gios make a offshoot brand?

the seatstay caps on my gios look sort of like that, but longer, not as stubby.

I agree that the stay caps are "Gios-like" but not exactly the same, for one thing the stays are single-taper so larger at the top than is typical for most Gios I have seen.
Another not-so-great clue for you: Olmo used the same head lugs in the '80s but not with that heart-shaped cut-out (They would have had a star if any).