[Downunder Dan]

No connection between the Offset Printing Co and GG Swan, as far as I can see. The colour "pocket size" format of this comic is an oddity - all the other OPC comics I've seen are regular size and black and white (including Red Steele and Shado McGraw issues). OPC were a regular offset printer for a few years, who started publishing magazines and comics in 1940-ish after the Australian government prohibited the import of American printed matter (I think that, during WWII, British books and magazines were still allowed). After WWII, OPC stopped publishing within a couple of years. There are other smaller size comics, mostly one-shots. The only title I've seen with multiple issues in a small format was Little Trimmer (although it changed to a regular size later).

Link to the comment: The Cobra Woman