 Mundin first travelled to America on 18 December 1923 for a series of theatrical engagements in New York.He sailed from Southampton on the "RMS Aquitania" and described himself in ship’s passenger manifest as 5'7" tall with a fair complexion, brown hair, blue eyes and a scar over his left eye.His big break as an actor was arguably with Gertrude Lawrence and Beatrice Lillie in "Charlot's Revue" when it appeared on Broadway in 1925.