You are spot on with this comment. I have been looking at various frames for countless hours over the last several days and this is one of the two things I could not match up with other frames that had the same other lugs. The other thing is the eyelets for the rear brake cable housing. Many of the Italian bikes of this period did not have them. A local builder from this period named Leonard used similar looking pieces for the rear seat stays, but his frames were much more refined than this one. The welding on the cable guides for the front and rear derailleurs looks pretty sad to say the least as it does the crown of the fork (easy for me to say as I have never done this!!). This is why I started to wonder if someone maybe made it themselves.