I dunno.....That filing treatment on the end of the stays looks familiar to me too:


My frame was identified as Losa built which was/is a company that built for many other Italian firms (like Guerciotti, Monti, Ciprandi, Magni, Ives, etc..) They also built frames and shipped them without paint to the US and were sold as house brand bikes.
Please measure the width of the bottom bracket shell to confirm if it is Italian. I'd like to see some pics of the underside of the lugs and the rear brake bridge as well. Is there a braze on to keep the shifters from sliding down the tube?