Der Herr mit der schwarzen Melone (1960)

Hugo Wiederkehr, as a dutiful bank employee, has to deal with all kinds of customers. Among other things, with the industrialist Meissen and his pretty daughter Christine, with whom he falls in love. However, it remains unmatched because it belongs to a different social class. He also works as a hobbyist and inventor, which also requires a lot of money. When his employer refuses to give him a loan because his father is in prison for fraud, he quits disappointed.