The Unknown Quantity
- Bliadhna: 1919
- Dùthaich: United States of America
- Seòrsa: Drama
- Stiùidio: Vitagraph Company of America
- Faclan-luirg: lost film
- Stiùiriche: Thomas R. Mills
- Cast: Corinne Griffith, Huntley Gordon, Harry Davenport, Jack McLean, Jack Ridgeway, F.R. Buckley
