Hi!

The banknote in question is of WWII origin. It is Japanese occupation currency produced for its occupation of the Philippines.

That was simple enough. What is more interesting is the stamp on the note and the history behind it.

"The Japanese War Notes Claimants Association of the Philippines, Inc" is what the stamp says, which meant that the note had been stamped by the organization with the same name. What the JAPWANCAP, formed in 1953, championed was for the Japanese occupation currency, held in large quantities after the liberation of the Philippines and not worth the paper it was printed on, to be redeemable in current legal tender. If you joined JAPWANCAP, you'd get your banknotes stamped and be issued with a certificate for a fee. The JAPWANCAP's goals never panned out and they constantly failed in court to redeem the 3.5 billion occupation pesos which they had in storage.