Photo with signature of Isadora Duncan at Palm Beach, Florida, 1917. Date of autograph unknown.

Image Courtesy of Skinner, Inc.

The inscription says:  To Percy McKay, " Poor me at Palm Beach".
Percy McKay was American poet, playwright and Isadora's friend. One of his known works is "The Scarecrow: Or, The Glass of Truth; a Tragedy of the Ludicrous".
Photo like this, but with another inscription you can watch here