You may recognize this bad boy from a prior post on the 1949 Play Coins Of The World Set. I snatched this piece up immediately (although I am happy to report I negotiated the price downward first) and left it until I got home and could safely examine it. The cello bag with the coins had ripped at some point so there is no way of knowing how many coins were originally within but I suspect more then five since the ten cent pack was a reissue if the coins inserted in penny tabs in 1949 (the piece above is from 1950 based upon the Flags of the World card attached to it). I believe the cello bag was originally stapled to the card in the upper left as there is an extra staple in it that does not attach it to the header card.
Here's the back, clearly showing scrapbook origins of some sort:
The two slots at the bottom make me think this came with a generic box that held the coins (and possible some Flags cards but I am not sure about that at all). It's a neat item.
If you have been reading along at home, you will note this is my 500th post-thanks for all of the attention and comments! Much more to come as we march toward 1,000!