Kid Colt Outlaw

Kid Colt Outlaw on Ebay
Kid Colt #1-229, August 1948 - April 1979.

This title (the first few issues of which were just Kid Colt was Marvel's longest-running and most successful Western comic book, featuring their most popular cowboy character.

Note that although there were a couple of giant-sized issues, there were no King Size Specials or Annuals for the title. But there was an issue of the Giant-Size series devoted to the character, as well as an Album released in 1950 for the British market.