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I dug up more. Some people said CB came from Clubman race. Then there are people who say it was after CA , so named CB.
But this guy asked Honda's ex officer who used to know Mr. Soichiro Honda while he was alive said it just came from CB radio.
The first "CB's" were produced around 1960 (CB72)...long before the CB craze of the 1970s. I worked in a shop many years ago, and we tried and tried to find any accurate info about letter designations. Never could.