don't look like Guerciotti stars (too pointy) but you never know: variations are possible.Given the portacatena DOs and the top-of-BB-guides it's probably late '70s (1978 is "probably" the earliest date possible for the DOs). Italian BB shell is strong indication of an Italian bike, but I suppose a custom US (or Canadian) builder might have used one and 26.8 could be Aelle tubing, could also be Tange (many possibilities there). Looks like the re-spray painter got really good adhesion with the red primer, but crappy adhesion with the yellow top-coat...undoubtedly NOT original paint...looks like a nice frame!