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(2) WW2 yellow seal emergency silver certificates. $1 and $10.
In November 1942, American soldiers landed in North Africa carrying money with an off-switch.
Yellow Seal (1) 1935A $1 North Africa Silver Certificate, Fr. 2306. It carried the same promise as any silver certificate: one dollar in silver, payable on demand. The yellow seal changed one thing. If the notes were captured in quantity, the Treasury could declare them worthless overnight.
Yellow Seal (2) 1934A $10 North Africa Silver Certificate, Fr. 2309. It paid the troops for the invasion of North Africa and then Sicily in 1943. Like with the $1, the yellow seal meant that the government could cancel the $10 if the war went badly.
In the end: neither note was cancelled because the the Allies won. What notes stayed good, soldiers brought them home as souvenirs. They\'re technically still legal tender today - a promise that was made to be broken but never was.