Steve McQueen's Josh Randall (Wanted Dead or Alive) was introduced in an episode of Trackdown: The Bounty Hunter (1958) (later spun off into its own series).
The character "Hoby Gilman" was introduced on Zane Grey Theater, season 1 episode 27 "Badge of Honor", aired in May 1957.
Hoby Gilman was one of the very few TV (or movie) western heroes who did not carry a Colt .45 revolver. Rather, he carried a .44 caliber 1877 Smith and Wesson New Model 3 revolver.
Typically has the sleeve cuff of his drawing hand turned up distinguishing Culp from other TV western heroes.