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Watch The Unknown Quantity (1919) : Full Movie Online Free Mary Boyne, who made shirts at four dollars a week, had no place for love in her life - only despair and hate for the son of the man who had plunged her family into deepest distress. Peter Kenwitz loved Mary, but because he was a mathematician and a pessimist by trade, his love was as hopeless as her chance for happiness.
- Released: Apr 14, 1919
- Runtime: 50 minutes
- Genre: Drama
- Stars: Corinne Griffith, Huntley Gordon, Harry Davenport, Jack McLean, Jack Ridgeway, F.R. Buckley
- Production Company: Vitagraph Company of America
