la banda degli onesti (1956)

the concierge antonio bonocore, together with two friends, in a cellar and with makeshift vehicles, starts to print fake banknotes. his son, who is a financier, is in charge of discovering the counterfeiters. the first attempt to pass off, as a test, a banknote succeeds, but only because by mistake, the only original coin that was used to make the copies was spent.