The book I have is the "2010 Gun Digest book of Guns & Prices"
It lists that a total of 4,291 GH model guns were made and only 430 of them had straight grips.
I have an old copy of Perter Johnson's " Parker-America's finest shotgun" and in there he lists estimated GH total production at 28,000.
How there is quite a gap between those to sources of information.
I just found it odd for my book to list the specific number at 430, but not list a value adder if the number was that low for the many years that Parkers were produced.
However the values book lists the GH as having "Parker Special Steel" barrels. Maybe they are not including the Damascus barreled guns in that production figure they give.