As you know, during WWII, U.S. forces in North Africa and Italy used $ 1, 5, 10 Series 1934A with a special yellow seal. This is because if large quantities of dollars had fallen into enemy hands, they could be declared out of legal tender, thus losing any value.
Nazi propaganda took advantage of this business for producing $ 1 bills with a writing that calls Italians to believe the dollars notes worthless.
Americans called its "bubbles soap dollar" because of the writing, that says:
"Le promesse americane sono sempre state vane, sono balle belle e buone, sono bolle di sapone...come questa banconota"
"The Americans have always made empty promises, balls are fine and good, are bubbles soap ...as this bill "
All these propaganda notes have the same serial number, D85826026A, and they were probably printed in Verona.
It's reported that they were distributed in several provinces of northern Italy.
The bills are reasonably faithful reproduction on thin paper. It's interesting to note that a well-worn piece was used as the original for the reproduction.