Occasionally I'll have no clear recollection of when or how a particular item was acquired. Such is the case with the four beat-up TOS trading cards in my possession. Most likely they were picked up at a convention in the mid-1980s. Given their condition, I hope I didn't pay too much for them!
I particularly enjoy the back of the Star Trek Lives! card which announces the upcoming initial Star Trek motion picture.
These cards are part of a set put out by The Topps Company Inc. ("Topps") in 1976 -- 88 cards plus 22 stickers. The excellent Wixiban site has a full breakdown of the set.