Follow up answers/photos
 

First, Thank you, each of you who have responded. It's enlightening and helpful to help understand some of what I've been wondering about. I knew that there had to be some sort of modification but I'm not a learned trap shooter, nor knew the reasons behind them, and this helps.
The research that I've been able to uncover, through the local historical group in Manning, is that: 1 - "Jno" was an accepted abbreviation for "John" in the early 1900's. This fits with one of the brothers. They are pretty sure the last name on the case is "Frahm", which also fits with the brothers. Both were active trap competitors. 2 - The barrel length is a solid 30". 3 - I have joined PGCA, what else should I do to get more benefit from the site? I am putting together a request for Parker research information.
I've included photos that some of you requested. As you can see there was a 1/2" piece added to the butt stock, along with the recoil pad. The addition appears to have been done quite well, with no raised edges, no chips, no cracks anywhere, and up close it appears to be the same type of wood but not the exact same finish (but pretty close). A question that I have, is it all worthwhile to attempt having the safety put back or would I be better to leave it as is, as it was apparently intended for trap? I tend toward leaving it, but I will be very interested in what I get back from Parker.
Thanks again for the help and any further information would be greatly appreciated.

More photos
 

Here are more photos of the stock

Thank you. That answers the quastion - the stock is not original.





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Stock
 

Dean, can you help me out with this. All serial #'s match and from the photos I've seen, it appears similar. Help me to see how it is not original. Not questioning you, just looking to help identify any in the future that I would look at. What should I look for may be a better question. Thanks.

The teardrop drop points are non-existent, the pistol grip extends 1/8" - 3/16" longer than would have been standard for a D grade, the checkering pattern is not consistent with any Parker checkering seen, the "nose of the comb" is way too long and too shallow for an original Parker stock, the wood looks like American black walnut crotch wood when a D grade made before the Remington era would have had imported 'Circassian' walnut.

If you carefully remove the screw holding the trigger guard tang and carefully lift up the tang and rotate it out of the way you would see the serial number stamped perfectly into the wood in the exposed channel.





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Stock
 

Thank you Dean. I always like to get new and helpful information. Have a wonderful New Year. Jeff

Another question Dean
 

You were absolutely right about the serial # not being there. Am I to assume that #'s match on fore end, barrel, receiver are all Parker. The stock then obviously was switched for one reason or another. I'm curious about what you think of the trigger - Parker or not? Also, there is little slide to the side of the trigger that I had not really noticed before I checked the stock for a serial #, what is the purpose for it? I've added another trigger photo that I think is better than the previous, and a picture of the slide in the back position and then in the forward position. Thanks again for the information you've provided.

The slide is the barrel selector.
By putting it in one position or the other you determine which barrel fires first allowing you to one choke or the other first.






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Nothing better than the taste of your 1st Parker! Enjoy, and welcome to the club!
Chris, AZ

Even though the trigger has a selector slide like an original Parker, the slide does not look like a Parker slide. The thing about single triggers is "If it works, it's great. If it doesn't work, it's useless." I hope yours works. Whoever made your trigger, it was not in the gun when the gun was new.