And the answer is...
1969
The ads are from Bassmaster magazine, one of their earliest issues which, at the time, was published quarterly. One of the stories, among others, featured structure fishing and Buck Perry, as written by then Hickory NC resident and record Invitational winner, Blake Honeycutt.
The Fliptail ad is interesting because of our Texas Rig discussion. It is featured in the ad as per a rigging option, but never referred to as a "Texas Rig."