Courtly-looking vintage 8×10 linen finish sepia tone chest-up studio portrait, boldly signed and inscribed in black fountain pen, “Best wishes/To my friend/Fred Worrell/Tom Mix.”  Fine condition, with a few small stains in the right and bottom borders, not affecting the image; and a pre-printed signature and sentiment in the image below his writing  Accompanied by a letter of authenticity from third-party authenticator James Spence Authentication.  The daredevil, trick-riding cowboy star was a favorite with the public for two decades, but less so with his co-workers on the set, where his hard drinking and quick temper made him ornerier than a rodeo-bound bull about to be rode for the first time.