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The Unknown Quantity cover

The Unknown Quantity poster

The Unknown Quantity(1919)

Cast

Corinne Griffith thumbnail

Corinne Griffith

Mary Boyne

Huntley Gordon thumbnail

Huntley Gordon

Dan Kinsolving

Harry Davenport thumbnail

Harry Davenport

Septimus Kinsolving

Jack McLean thumbnail

Jack McLean

Sammy Boyne

Jack Ridgeway thumbnail

Jack Ridgeway

Thomas Boyne

F.R. Buckley thumbnail

F.R. Buckley

Peter Kenwitz

Writing

O. Henry thumbnail

O. Henry

Story

G. Marion Burton thumbnail

G. Marion Burton

Writer