The Unknown Quantity
- बर्ष: 1919
- देश: United States of America
- विधा: Drama
- स्टुडियो: Vitagraph Company of America
- कीवर्ड: lost film
- निर्देशक: Thomas R. Mills
- जात: Corinne Griffith, Huntley Gordon, Harry Davenport, Jack McLean, Jack Ridgeway, F.R. Buckley
