These are the 44-cent Cowboys of the Silver Screen commemorative stamps, available as a Pane of 20 stamps. On April 17, 2010, in Oklahoma City, Oklahoma, the USPS issued a 44-cent, Cowboys of the Silver Screen commemorative stamp in four designs in a pane of 20 stamps and a booklet of 20 stamped postal cards, both designed by Carl T. Herrman of North Las Vegas, Nevada. With the issuance of the Cowboys of the Silver Screen stamps, the U.S. Postal Service� honors four extraordinary performers who helped make the American Western a popular form of entertainment. Film stars from the silent era through the singing era are featured on the stamps: William S. Hart, Tom Mix, Gene Autry, and Roy Rogers.