The Unknown Quantity
- ປີ: 1919
- ປະເທດ: United States of America
- ປະເພດ: Drama
- ສະຕູດິໂອ: Vitagraph Company of America
- ຄຳ ສຳ ຄັນ: lost film
- ຜູ້ ອຳ ນວຍການ: Thomas R. Mills
- ຫລໍ່: Corinne Griffith, Huntley Gordon, Harry Davenport, Jack McLean, Jack Ridgeway, F.R. Buckley
