Appearances

Title	Role	Year	Approx. Age
Penrod and his Twin brother	Penrod	1938	17
Penrod's Double Trouble	Penrod Schofield	1938	17
The Prince and the Pauper 1937	Tom Canty	1937	16
Penrod and Sam 1937	Penrod Schofield	1937	16
Anthony Adverse	Anthony Adverse age 10	1936	15

Billy and Bobby Mauch were identical twins and Bobby is best known for playing the "Prince" opposite his brother Billy's "Pauper" in the rousing classic The Prince and the Pauper (1937) starring Errol Flynn. (Bobby is ten minutes younger than Billy).

When Billy was cast in "Anthony Adverse," Bobby was to be his stand-in for unimportant scenes. Once the film was completed, however, the twins revealed to director Mervyn LeRoy that they had taken turns playing the lead role throughout the movie, confident that no one would notice. They are said to have played the same trick during the filming of "The White Angel," where Billy again was cast as the lead.

There was a ruling in the Armed Forces that twins cannot be separated unless requested. Both Billy and Bobby served in the Air Force in the Philippines and appeared together in the Broadway play "Winged Victory."

Years later they both worked behind the camera, Billy as a sound editor, his brother as a film editor for the television show "Dragnet." Billy and Bobby once ran successfully together for senior high school class president with the catchy slogan, "Two Heads Are Better Than One."

The only noticeable difference between them is that Billy is left-handed, and Bobby is right-handed. Billy died in 2006 and Bobby died one year later in 2007.