Charles Drake was in over 80 films between 1939 and 1975, including The Maltese Falcon, Winchester '73, Harvey, The Glenn Miller Story, and No Name on the Bullet. Like many bit players in the '40s and '50s, he made the transition into TV, making appearances in Laramie, Wagon Train, F Troop, The Virginian, Daniel Boone, and The Rookies. Trekkies will remember him as Commodore Stocker in the Star Trek episode The Deadly Years.
Moses Gunn was an African American actor who started out on the stage as a Shakespearean actor before moving into films and television. He was nominated for an Emmy for his role as Kintango in the miniseries Roots. He played mobster Ellsworth "Bumpy" Jonas in the first 2 Shaft movies, and also played in Rollerball, The Hot Rock, and Heartbreak Ridge, as well as Little House on the Prairie and Father Murphy.
And I know they're not exactly Western actors, but 2 of my favorite comedic actors were born on this day. Groucho Marx (1890-1977) and Bud Abbott (1895-1974).