Australian reprint comics mavens are familiar with K.G. Murray's Mammoth Annual and Gigantic Annual series of blockbuster-sized comics which contained coverless rebound issues of their regular series issues.
Less well-known is World Famous Comic Annual - the Atlas Publications version of Mammoth and Gigantic, which predated the K.G. Murray titles, and ran for 11 issues between 1951 and 1955, according to Ausreprints.com.
There are three significant points of difference between the Atlas and Murray issues:
1. It appears World Famous Comic Annual was a mail-order item. As per AusrReprints.com "The advertising for this comic directed orders to "Beltern Merchandising Co. 282 Queen's Parade, Clifton Hill." This is Atlas' address." This may account for the relative scarcity of this series;
2. Issues of World Famous Comic Annual contained 9 rebound 24-page comics, compared to the regulation 3 issues of the K.G. Murray titles (which were initially 100-page issues);
3. The rebound issues in World Famous Comic Annual retained their covers, unlike the K.G. Murray issues which were coverless.
My copy of World Famous Comic Annual #1/NN contains the following rebound issues:
The Katzenjammer Kids #16
Buck Ryan Detective #17
The Lone Wolf #20
Flynn of the FBI #9
Sergeant Pat of the Radio Patrol #21
Captain Atom #51
I'm unsure of the date of this issue. AusReprints.com guesstimates 1951, yet some of these issues are from 1952 according to AusReprints.com.
I have previously discussed other such titles with rebound issues, for example Dell's Fantastic Adventure and Daring Adventure, and Gold Key's Amazing Adventure, not to mention K.G. Murray's other minor forays into this arena with horror and romance titles such as Young Love Romances, All Love Romantic Stories and Scary Stories Annual. I expect there are others - I don't think I've seen a Transport or Horwitz equivalent but would love to spot such an animal, especially with the covers included.