Thanks for your response Motobrox.
Well, the engine and frame have the same number.
It is a cylinder of the Pollini brand now, which is what I understand
an aftermarket cylinder.
I'm not entirely sure that it's a LB80 from the beginning, but I do not believe it when it only sold around 300 such in Sweden.
Is there anything that distinguishes the models that directly shows which model it is?
This is my Chappy:
http://www.pbase.com/silpingeholken/image/127813091