This is a pack that was made by the Patriotic Playing Card Co. in Montreal, Canada, in 1916/17. The box shows the name of the pack:
They were printed in six different versions. All of them show political leaders and military persons on the court cards, and often also on the aces, but there are changes between editions. In the version shown here you can see:
|King||Nicolas II. Tsar of Russia|
|Queen||Alexandra Tsaritsa of Russia|
|Spades:||Ace||Peter King of Serbia|
|King||Yoshihito Emperor of Japan|
|Queen||Sadako Empress of Japan|
|King||Albert I. King of the Belgians|
|Queen||Elizabeth Queen of the Belgians|
|Diamonds:||Ace||Victor Emanuel III., King of Italy|
|King||His Majesty King George V.|
|Queen||Her Majesty Queen Mary|
On the back were flags of the nations. This pack has seven flags on the back.
There are also older versions with only six flags in a different arrangement, lacking the flag of Italy. Three of the Aces are also different in the version shown below: the Ace of Diamonds is without illustration, and the two men on the Ace of Spades and the Ace of Hearts have been exchanged.
Actually, the box shown at the top is from this version.