Given the unusual job number for this era, it seems likely that this was a story originally created for the Cynthia Doyle series before it was discontinued in 1964. Minor changes may have been made (such as Bob Steavens' sideburns), but otherwise this story looks like it could have fit in very well in the early 1960's.
In the original Cynthia Doyle series from Charlton, Cynthia's love interest is Dr. Ed Benson. Here Dr. Benson's first name is never mentioned, but Cynthia does tell him that 'a little romance wouldn't hurt' him when he accuses her of being a romantic.
Although Cynthia Treat is a brunette and Cynthia Doyle was portrayed as a redhead, the hair styles are the same.