10x13 inches (25.4cm x 33.0cm approx)
Featured Marques: Stutz
Condition: Borders probably very slightly trimmed, otherwise extraordinarily fine condition.
Tom Mix is of course more usually associated with cowboys and Injuns, which makes this and the other couple of lobby cards (which you can see separately) even more intriguing.
After hours leafing through reference books, my best guess for the racer is a Stutz.
VERY rare early lobby card.