2-1/8”. No maker. Choice color art centered by lady in riding outfit next to her horse and petting her dog’s head. Portal gates are inscribed for company’s “Horse, Cattle And Dog Medicines” and “Home Treatment For Dumb Animals.” Local agent name is printed in black at top center reading “Compliments Of/J.J. Henninger/Emmaus, Pa./Special Agent For…” Couple of silvering dots off the perimeter of the mirror but very minor and the celluloid is Exc., displaying Mint.