US numismatics expert Peter Rexford said nowadays those occupation bills normally trade for a dollar or two apiece.
In his "Stamp and Coin Exchange" column published in last Fridays issue of The Washington Times, Rexford was asked if paper money issued in the Philippines during World War II was a collectible item.
He replied: "Absolutely."
"Philippine currency is some of the most attractive that is produced in the South Pacific. For decades, it emulated US currency even including the portrait of George Washington.
"That changed during the Japanese occupation of 1941-1945, when the Japanese modified it to more reflect the currency in Japan. They did, however, keep the denominations. Those occupation bills normally trade for a dollar or two apiece.
"During the occupation, Philippine rebels hid and fought in the Apayao mountain country. As soldiers, they expected to be paid but had no interest in or use for the Japanese-issued currency.
"Consequently, emergency legal tender was printed. It was comparatively crude, and each note was hand-numbered.
"Nice as it must have been to get paid, because rebels had no central bank, the notes technically were IOUs redeemable only after the war.
"Worse, it was ill-advised to carry any. If captured by the Japanese, anyone in possession of the rebel currency was executed.
"Clearly," Rexford wrote, "its one of the few times in history when it was beneficial not to have money."