some odd details, but after you get past the "Olmo/Atala/etc." seat post collar, there really isn't anything else that points to Italian. With a BSC BB and the lugs (which look vaguely "Carlton", but probably not that marque) I think you have to say "British". The RGF (Gargette brothers) BB shells were used by many builders (including many Brits) well into the late 70's, but this frame seems earlier: note the thin seat stays. Probably a 26.8 seatpost indicates a plain-gauge seat tube. I think the track ends once used "chain tugs". It sure deserves a vintage fork, maybe once you find out the make you can determine the style crown it should have.
edit: I looked for some Carlton lug pics, and tho I didn't find any exact matches, noted that many Carltons from the '50s used a headtube decal, not a badge...check out the '55 "RoadTrack" lugs, sort of in the ballpark...perhaps this is a Carlton imitator.
http://www.carltoncycles.me.uk/details/lugwork.htm