Hi CCM stands for Canada Cycle & Motor Corp Ltd. They made bikes for years, still do and another branch, different company and owners, makes sporting equipment. Many NHL players use CCM skates and equipment. Anyway, the Duomatic was a special model made from middle or late sixties, can't remember exactly, until the middle seventies. The rear hub assembly was made in Germany and I attempted to buy another in 1978 or 9 and was told they were discontinued as the mfg could not meet the supply. It is a great bike and the one we have, purchased for our son in 1973 or 4 still runs and looks great. It has been hanging in the garage for roughly 30 yrs and is now for sale. Chrome rims and fenders still glisten. Alex Jackson