Silent Movie Star Caricature First Day Covers 1994. Postmarked in San Francisco, California in on April 27, 1994. They are:,Theda Bara; Clara Bow; Charlie Chaplin; Lin Chaney; John Gilbert; Buster Keaton; Keystone Cops; Harold Lloyd; Zasu Pitt’s; and Rudolf Valentino. These are stamped with 19 cents stamps. Shipped with USPS First Class.