This Tokai 100mW  walkie-talkie was one of my father's original pair, which he had purchased sometime in the 1967-68 timeframe.  This unit features a metal case, and a superhet receiver with Volume control and an earphone jack. The radio was a single channel unit which was originally equipped with crystals for Channel 7 plugged in, and it was powered by 7 AA batteries.  I can remember using these walkie-talkies down at the New Jersey shore to talk to another boater friend of my father's.  So I guess this might count as my "being in CB" even earlier than 1970.  But my usage of these was sporadic, and not as a hobby.