Hi, sorry that no members picked up on your post 11 months ago. Hopefully you're still around. I see a Piaggio decal which places it 1980-1984. The pics don't allow me to identify any of the major components but the rear derailleur appears to be a slant parallelogram type with a steel body. Consequently, it should be Suntour and fairly low end. Assuming it is OEM would mean the frame is of Japanese origin and entry level, probably one of the Sport variants. The serial number would tell us the exact year. ics of the major compoents (crankset, brakes, derailleurs) would allow us to determine the model. The wheels have been replaced, based on the dark anodized rims.