Artist credits from "Action! Mystery! Thrills! Comic Book Covers of the Golden Age: 1933-45" (Fantagraphics, 2011). Character on cover is not one of the featured characters inside. There is no reason to think that Kirby ever worked for Jason Comic Art. Therefore this is almost certainly a swipe.
Inside front cover. Also includes indicia which gives title as K-O Komics and states that it is published quarterly by Gerona Publishing Co.
Sam Cooper attribution as artist from original indexer. Art does not match artwork done on same feature in Top Spot Comics #1 which was identified as John Guinta by Jim Vadeboncoeur, Jr.. Bails' Who's Who identifies Sam Cooper as drawing Duke of Darkness for Gerona.
August Froehlich art id based on art id for Top Notch Comics #1 by Jim Vadeboncoeur, Jr.
Not by Infantino and Cohen (the artists on The Menace story in Top Spot Comics #1) according to Jim Vadeboncoeur, Jr.
Inside back cover.