A Swedish Magazine called Fickjournalen ran a collectible set of mixed Athletes,Film Stars and Musicians.
Each issue starting in 1952-54 had a 4 card sheet on both the inside covers..front and back.
The sheet could be removed from the staples yielding an 8 card sheet or cut in half for 4 card sheets..of course individual cards could be cut out too.
I'm shocked that Master sets for some of boxing's greatest like Marciano and Walcott don't show these cards in their Master sets.
I'm curious why not..yes these are rare to find but they do show up on occasion and are very early cards for these boxing stars.
here is a link to an example of an 8 card sheet featuring Marilyn Monroe.
https://www.ebay.com/itm/333625683262