Japan 1000 Pesos Stamped ?

The Japanese War Notes Claimants Association of the Philippines Inc. (JAPWANCAP) was an organization set up in the Philippines to try to obtain face value or a reasonable fraction thereof in post-war money for Japanese-issued occupation money. They collected millions of pesos of otherwise-worthless Japanese Invasion Money notes and then (unsuccesfully) tried to take the Philippines, Japanese and US governments to court in their efforts to redeem the notes they held. They get a mention at the end of the Wikipedia article on JIM.

They are an interesting aside to the story of JIM, but last I heard JAPWANCAP stamps made no difference to the value, worth neither more nor less than notes that were not stamped by JAPWANCAP.