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I once saw a program about how prisoners in one of Hitler's concentration camps were forced to forge pounds and dollars. The Nazis in OTL thought of dropping them over the UK during WW2, but used them to buy supplies instead.

What if the forging money had started before the war began, and a day or two before Poland was invaded and WW2 began, German bombers had flown over the UK and France by night, and dropped, not bombs, but forged banknotes by the ton?
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