1937 will bring innovations in the Challenger, as the Visometer Ink Supply, a transparent section, to warn when de ink is low. Toward April, the Royal Challenger started to change the sword clip for a V-clip stepped and then replace the 3 cap rings for a decorated cap band. Around the same time the rest of the line, the Challenger and the Challenger DeLuxe, change the ball clip for a plain V-clip similar to the one that years later would be fitted in the Parker V-S.
In 1937, following the Vacumatic line, the Challengers streamlined its shape.
In 1941, with the arrival of the Parker «51», featuring a variety of second and third lines as the ringed Vacumatic, Sacless Duofold, and Parkette Zephyr, the Challenger was discontinued.