First thing I note is that those barrels are much later than the frame. The rib legend CT, U.S.A. began about WW-I time frame.
According to the Grade 6 listing in
The Parker Story, 100370 began life as a D6 12-gauge 30-inch with no extras. So, it was a Damascus barrel, double trigger, plain extractor, slim forearm gun, but a righteous Quality AH. From a catalog at the time 100370 was new --
Quality AH, Blue Ink Catalog.jpeg