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I don't think Peugeot ever made a 'plastic heavy' motorcycle. They were actually out of business before plastic really became useable.. I think :)

Yeah Im not an expert, it could have been some kind of moped or scooter, I just think I remember seeing like a french plastic looking thing from the 70ties? Where the frame was made of something looking like plastic, but I could be wrong... =)

Cheers!
/FF