This strip comes from the 1967 Wham! Annual. Eagle-Eye, Junior Spy, the strip that introduced Grimly Feendish (the Rottenest Crook in the World!), was created by Leo Baxendale but I'm pretty sure this doesn't feature his work. Many artists copied his style and while there's nothing wrong with this piece, to my eyes it lacks the Baxendale magic. (Click for larger images).