I had a friend as a kid who had a bike called a Zipper. I don't know the manufacturer but it was just like a Chopper and probably just as rare and collectable now. It was bright yellow and cool as anything. I have just bought a Chopper at an auto jumble in pretty good order. It is a mk. 2 1972. My wife and had them as kids and reminisced about them so when we found this one we had to buy it and ride it!