I am sure this thread was started speaking about the P. Johnson book entitled "Parker: America's Finiest Shotgun".
I have a copy of that book. Picked it up pretty cheap on Ebay. It is a good read, and has very good information. One thing that I found is that being it was writen so long ago that there is some informaiton that is not 100% accurate. One that really caught my attention was that it says that only 2 invincibles were produced, and we know now that the figure is 3.
And I think that the production figures by Grade may be off in spots, but Johnson states that fact clearly.
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