The 7 King of the Royal Mounted issues of Four Color (Dell, 1942 series), #207, 265, 283, 310, 340, 363, and 384 were counted by Dell as the first 7 seven issues of this series.
There is a one-year interruption between issue #19 (April-June 1955) and #20 (March-May 1956).
The indicia lists the comic as "Zane Grey's KING of the ROYAL MOUNTED" up to issue #21 and then just "KING of the ROYAL MOUNTED" after issue #22. Following the American comic book indexing convention, this series is listed based on the title in capital letters.
This feature continues in Four Color (Dell, 1942 series) #935.