The Riddlers:
Dan Malstrom - organ
Steve Kirkman - lead vocal / bass
Carl Roach - guitar
John Barkow - drums
From LaPorte, Indiana, the Riddlers. Other than Steve played with the band for awhile, I don't know much about them.
The ad is from December 1966.
Steve was a founding member of the Bare Facts, and thanks to him we now know the "Instant Happiness / There won't be a next time" 45 is from that band! Very cool!
Dimensions is new to me, but the Swingin' Stingrays are coming soon!
Thanks Steve for the photo!