CBs were tube frames (and CLs), CAs (dreams) were stamped. CAs have one carb, CB/CLs two. Although CAs have their fans, and I've been told maybe the ones I've ridden weren't great examples, I find the CAs a bit wobbly and dodgy compared to the CB/CLs. CAs have their fans and collectors, but I think the CB/CLs fetch a little more. CB72s were the 250cc version -- they are rare and some people seek them out -- but they were made alongside the CB77s but only for 3 years (1962-65). Their little brothers, the CB160, was made from 1964 or 1965 to 1969, and there were CA160s too.