A fabulous Parker Andrew! As they say in collector's circles, "Condition is everything." and yours appears to have easily 95% of it's original condition. Congratulations!

It looks like a very late '20's or early '30's Parker and there was a missing book or two in that range of serial numbers.

Andrew, PGCA resourses should be exhausted, but that is not the end of the research trail. Griffin and Howe has an Abercrombie and Fitch research service on their website. I am in the DC area and would be glad to help, but the ballpark estimate you received on this thread is not far off in a good market. If you would like to chat or get information on the Griffin and Howe research services, email me at wilmrph@verizon.net. Bill Murphy

Since no one has mentioned it please take that leather covered cheek pad off the stock, the chemicals in the leather can damage the stock finish. BTW a very beautiful gun...

True, just put it on if you need it while shooting and take it off after use. Besides it hides the wood and lots of Parkers had great wood.

A few more pics
 

Wow, thanks for all the interest and advice. I really appreciate it. This is a great forum.

Here are a few more pics.

Andrew ,There is some things in life I would never sell unless I damn sure needed to and this would be one of them. Your grandfather must or does think alot of you so do him Proud and Take good care and enjoy this fine gun !!

Andrew: Yours is undoubtedly the finest O frame 20 bore CHE that I, personally, have ever seen. I sincerely hope that you keep it and treasure it. The above advice about the lace on pad is correct. Take it off but keep it with the gun.

Best Regards, George

That is a spectacular Parker. Advice on removing drool from keyboards would be useful for this thread.