Judging from the lack of brazed fittings, late 60s to mid 70s. You can probably get a closer estimate from the NR rear derailleur. It should have a patent year and a manufacturing date code.
I was going to say that for $25 it was a good deal even with those bars, but then I finished reading the post. Did it have Cinelli Giro bars with a 1A stem?
edit: I can't really tell what the pedals are -- maybe NR pedals, too. Yes, that's a screaming deal for $25.