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Mabel Stark (called the "Tiger Queen") was a friend of the submitter's great-grand uncle, James Leo Duffy ('Bert Leo"). I am not sure what circus she was performing with at the time these photographs were taken. Bert Leo performed as a clown in the following circuses: Al Barnes' Circus, John Robinson's Circus, and Sells-Floto Circus. Mabel probably worked for one of these circuses.
Photographs from the collection of Eileen McCummins Stickle, great-grand niece of James Leo Duffy.