From the components, it would be a middle-of-the-road kind of bike, price range around $150 in 1975. Certainly not a high end Paramount, and any other Schwinn didn't have a lugged frame. So probably European or Japanese. Can you see a brand name on the crankset? Are the rims steel or alloy? You might pin it down to the country of origin by measuring the bottom bracket shell width and figuring out if the fixed cup has left or right threads and the cup diameter and tpi. French, British, and Japanese headsets are also of different sizes. The head lugs are an odd shape that I don't recognize, and that probably means that it's not a Raleigh or Motobecane. BB lugs are pretty standard.