During World War II, when the Japanese occupied the Philippine Islands, the resistance forces used their own form of money. Here are some samples of this "guerilla money":
A five peso note (front)
A five peso note (back)
A 20 peso note (front)
The back of a different 20 peso note (front)
Eventually I'll catalogue more of these and get the images loaded for you.
Find more info on the Philippines at: