Hi Mearl,
PGCA members provided you sound advice and shared their knowledge. You may in fact have a Trojan that was returned to the factory and "upgraded". If that could be proven via a repair record you would indeed have a valuable gun! Without proof a serious collector would not pay for more than your gun is, a Trojan that has been nicely upgraded. Unfortunately, upgrades are rarely worth the money spent on upgrading them.
Those gentlemen from Bass Pro, the engraver, and others who gave you their assessment of your Parker MAY be knowledgeable of this subject. The PGCA members who take their time to share their knowledge and wisdom toward Parkers ARE very knowledgeable. I have learned to strongly consider their advice. Or, you could send your gun to DelGrego, Brad Bachelder, or other noted Parker gunsmiths and pay for their time to access your Parker.
Please try to provide high resolution photos and post for all to see.
PS: I own a AH “upgrade” that many noted PGCA members swear is a AH rather than an upgraded GH.
http://www.parkerguns.org/forums/album.php?albumid=294
Without proof it is a wonderful upgrade that cost me 1/3 what a documented AH would have.
Mark