From Rock Island Auction:

This beautiful and historic Colt Single Action Army revolver is inscribed to legendary Mexican Revolution leader Francisco “Pancho” Villa and is accompanied by multiple factory letters starting with a letter from July 2, 1958. The letters confirm that the revolver was the sole gun of this type sold to Shapleigh Hardware Co. in St. Louis, Missouri, and shipped to City Loan & Jewelry Company on April 18, 1917, in factory order 313.