Alan,
Welcome to the Parker site. Your very luck to have inherited your great grandfathers Parker. I have 2 Parkers that were my grandfathers and I wouldn't part with them for a million dollers. I'll try and answer as many questions as I can based on what you said and what the Serilization Book has listed.
The book lists your gun as a DHE, 34" barrels, and a capped pistol grip stock. You've confirmed that the barrels are 34" which is fairly rare and a plus for you. I do question the originality of both the stock and forend. Take the screw out of the trigger guard, gently lift up the tang and rotate the guard CCW. The gun's serial number should be stamped in the wood. The same applys to the forend wood, take the screws out and separate the metal from the wood and the serial number should be stamped in the wood. It's not uncommon for a beavertail to be made aftermarket and since you indicated that the trigger guard is not the same serial number as the rest of the gun, that's evidence that a different trigger guard was put on to accomodate the straight grip stock. Check out the serial numbers on the wood to make sure.
As far as the forend not going back on, make sure that both hammers located in the forarm are cocked in the down position. You can use a wooded dowel or other non maring object to push it back down if it is indeed up. It should stay down when you release pressure. If it doesn't than something is broken and would need repair. Never take the forarm off if the triggers have been pulled. Always have the gun cocked before taking the forarm off or you will have to manually cock the ejector hammers.
It could be that the safety was made with a safety, then taken off and the holes filled or it could have been ordered without a safety. Looks like there are 2 small filled holes evident in your picture.
For the single trigger, a closeup of the trigger assy and it's selector will help other members familiar with single triggers identify the manufacture. If it was a Miller single trigger, it would be stamped on the side of the trigger.
Value is just a guess. The 34" barrels are a plus, reblued barrels and replacement stocks are a minus. If I had to guess, in the 3k range. Del Grego is certainly the guy to go to if you have ejector problems.
Lastly, there are surviving factory records for your gun. In fact if you get a letter, you may find reference to your great grandfather as being the guy who ordered it. You never know! Check the home page link to download a information sheet. Also, you should consider joining our great group and you will get a discount on the letter.
Good luck.
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