The Serialization Book is made up almost entirely from the entries in the Stock Books this includes all grades both hammer and hammerless. These guns were put into a database. There are a total of 30 Stock Books missing that the PGCA doesn't have records for. Each book has about 300 pages so that's approximately 9,000 guns that couldn't be put into the database used for the Serialization Book.
Before publishing the Sterilization Book, we were given access to the Order Books. It was decided to make a database for the Order Books and to search the Order Books for all the guns grade 3 and above that were missing from the Stock Book database (think Sterilization Book) and add them to the database used for the publication of the Sterilization Book. Can you imagine if all guns below grade 3 were included. Remember that Parker made 242k guns. It was just too much work to include all grades from 0 to 9.
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