yes seems like a frame from a small builder..
the low serial number might reinforce that.
nice workmanship on the fastback stays
the head lugs seem consistent with the seat lug to me.. just a little bit of thinning...
and the brake bridge seems like an off the shelf investment cast piece
the seatpost diameter would help determine the butt thickness on the seat tube
Originally Posted by repechage
Investment cast lugs
Columbus tubing transfers, with no mfg. info...
fastback style seat stays, with fillets, too much work for production by this time.
extra worked seat stay bridge, and fork crown, stay ends.
The head lugs are incongruent with the balance of the workmanship
If English or Italian threading I would say aspiring/journeyman USA framebuilder.
very small chance of a front end repair by a less qualified torch.