I wasn't around in 1965 so I cannot speak to this card from personal experience but I understand it was part of a set offered as an insert to the regular-issue Topps set.
So basically, when you opened up your pack of cards, one of these embossed beauties was randomly inserted. Did you also get the stick of gum? I guess. I'm really not sure.
By the time I was seriously collecting cards, all I ever got was that stale piece of gum. But that didn't stop me from chomping on it.
I know Topps experimented with several different inserts including posters and I think coins.
This is where I need your help. Do you have a favorite Topps insert? Was was it and from what year?
And someone please answer the question: Was the piece of gum included?