Mr. Dudley,
If you are serious about learning about your GH please visit the Parker Gun Collector Association forum at:
http://www.parkerguns.org/forums/index.php When there be prepared to disclose the complete serial number so that member may check it in PARKER GUN IDENTIFICATION AND SERIALIZATION book. I own a splendid GH 10 with a straight grip that left Meridian as a capped pistol grip. I also own a wonderfully restocked by Remington DHE 20 that left Meridian as a straight grip but is now a capped pistol grip. A lot of stuff can happen in the life of a 100+ year old gun! Also, good quality photos will reveal much.
The annual Gun Digest and their other publications are great entertainment for they cover a very wide range of firearms. I would not however rely on Gun Digest to be experts on Parker guns anymore than I would rely on the PGCA as an organization of dedicated Parker enthusiasts to know much or do a photo shoot on a Ruger Single Six. When I was young I studied every article in Gun Digest, Gun World, Shooting Times and other publications. Now, several decades later I dive into THE PARKER STORY and books by Muderlak and Johnson (which you have) for information on Parker guns, McIntosh for AH Fox, and others who study their subject. Authors who write about certain guns rarely make a lot of money (based on a per hour rate) for researching and writing their books. They do it for love of their subjec matter.
For a range of values most use Fjestad's
annual BLUE BOOK OF GUN VALUES. That stated a gun or any object is only worth what another will pay for it. In that regard, Fjestad is the most accurate.
