Which film, "Under the Roofs or Paris" or "L'Age d'Or", achieved great international success as one of the first French sound films of 1930?
Under the Roofs of Paris:  However, "Under the Roofs of Paris" was the first French production of the sound film era to achieve great international success. L'Age d'Or:  "L'Age d'Or" was one of the first sound films made in France, along with "Prix de Beauté" and "Under the Roofs of Paris".
Under the Roofs of Paris