The Emperor Waltz (1948)

Traveling Salesman Virgil Smith wants to sell his Grammophones in pre-WWI Austria. To enhance this, he especially wants to sell one to Emperor Franz Joseph, but at first the Austrian palace guards think he is carrying a bomb. He meets the Countess Johanna von Stolzenberg-Stolzenberg and after the usual misunderstandings, falls in love with her, this is especially assisted by his dog Buttons. But the relation between a Countess and an ordinary U.S. citizen cannot work in Austria, that is the Emperor's opinion. Is he wrong ?