A rare find is this Zenith Stamp Co. (now defunct) approval book No. 12 from the 1960s which features an assorted collection of world stamps from between 1919 to 1953. This approval book showcases multi-coloured stamps with hand-stamped cancellations.  It is very difficult to find such an item as mostly they were targeted to young (children) who were stamp collecting so there are no longer many available.  This is a great addition to any collection.  The stamps included in the approval book are not graded.  I have outlined below to you the date range together with the description of the contents which consists of assorted denominations and currency from various regions around the world: 

1) Germany (Russian Zone) 1952:  Two (2) commemorative sets: Berlin Rebuilds and Famous Men. Cancelled.
2) Germany (Russian Zone) 1952:  Two (2) sets: Leipzig Fair and Vienna Congress. Cancelled.
3) Germany (Russian Zone) 1952:  Three (3) commemorative sets: Stamp Day, Halle University and Gorki.  Cancelled.
4) Greece 1934-37:  Athens Stadium and the University of Athens.  Cancelled.
5) Italy 1952 - 1953:  11 Different commemorative stamps. Cancelled.
6) Jugoslavia 1948.  Communist Party anniversary set. Cancelled.
7) Jugoslavia 1948:  Kosir commemorative set.  Cancelled.
8) Netherlands 1928: Pioneer aviators set. Mint.
9) Brazil 1949:  Universal Postal Union.  Cancelled.
10) Poland 1941:  Offices Abroad. Mint.
11) Russia 1945:  Battle of Stalingrad Set of 2.  Cancelled. 
12) Russia 1945:  Academy of Science Commemorative Set.  Cancelled.
13) Siam 1928:  King Prajadhipok Set of 8. Cancelled.
14) Spain 1936: Madrid Press Association Set of 9. Cancelled.
15) Wurttemberg 1919: "Bolksftaat" Officials Set of 9. Mint. 
This uncategorized book is a really interesting item.  Thanks for viewing.