I sold the Olympia One when new, back in 1980. If my memory serves me, the original Oly had the Super J styling, meaning the handle, flat to the machine body side bumpers and the wheels were smaller than the later ones. I sold the newer version with the later syle handle, extended side bumpers, and they increased the size of the wheels, I'm assuming carpeting was getting thicker, and it would roll easier. I have both models in my collection, will have to look to see if there's a difference in the model numbers. That could be why there's a difference.