Found this image of Ruark on the PGCA forum, unfortunately uncaptioned, with a straight stock small bore Parker. Possibly a Trojan, but only 2 28g Trojans were manufactured.
It could of course have been a borrowed gun

[Linked Image from photos.smugmug.com]

Add to the list of unfortunate choices John Taintor Foote, author of "Dumbbell of Brookfield" and "Pocono Shot"