The Unknown Quantity
- Jaro: 1919
- Lando: United States of America
- Ĝenro: Drama
- Studio: Vitagraph Company of America
- Ŝlosilvorto: lost film
- Direktoro: Thomas R. Mills
- Rolantaro: Corinne Griffith, Huntley Gordon, Harry Davenport, Jack McLean, Jack Ridgeway, F.R. Buckley
