The subject frame was manufactured by Scapin of Italy. It has two of their distinctive features, the three circles embosses in the lugs and the heavy embossed line around the stay caps. Scapin are one of the most under rated Italiann manufacturers. My all time favourite frame was a 1974 Scapin. Based on the presence of a front derailleur hanger but the lack of dual bottle bosses, it is likely circa 1982-1984. A drive side photo may help. Picture assist...