This is a vintage Doc Holliday photo pendant by Ravensdaughter. This glass dome pendant measures 1" x 1" and comes with a black waxed leather cord.
Historical Note: John Henry "Doc" Holliday was an American gambler, gunfighter, dentist, and a good friend of Wyatt Earp. He was a Deputy U.S. Marshal during and after the Gunfight at the O.K. Corral.