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The Unknown Quantity
- Año: 1919
- País: United States of America
- Género: Drama
- Estudio: Vitagraph Company of America
- Palabra clave: lost film
- Director: Thomas R. Mills
- Emitir: Corinne Griffith, Huntley Gordon, Harry Davenport, Jack McLean, Jack Ridgeway, F.R. Buckley