Some of the books that record the factory information were not available to the PGCA when the records were copied or are simply missing. The information in that book is based on those copies.
Yes, there is more information on some guns than found in the ID & Ser # book. There is a good amount of information on the PGCA Letters to be found in the FAQ section on this site. There are two FAQ pages on this site, one here in the forum section and one off the main page, the one you want to see is the one in the main parkerguns.org page. Read the 6 FAQ's in the "Research" section in the FAQ page. That should give you an idea of what is available.
Also, if you click on the "Research Letters" link on the main page, it will lead you to another link where you can input your serial number to learn if there is information in the collection for that gun.
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