Ein gemachter Mann oder "Falsche Fuffziger"(1979)

In a western country, the police are on the lookout for a counterfeit money gang. During the closure of a brothel, the small inspector of the vice squad receives a reliable tip. The chief of police wants to take credit for the success and leads the bust of the counterfeiters. While he celebrates his success, the little detective gets into an almost ruined bank with a piece of counterfeit money he has captured by chance and becomes a rich man in high society.