The 220k serial numbers are in the miscellaneous ledgers. There are thousands of entries, and they are in a mess. None of the serial numbers are in order. It is challenging and takes hours to go through the Miscellaneous Ledgers line by line (I've done it several times collecting information for research letters).

The manufacturing information in the these ledgers was recorded when the Hunter Arms Company was dealing with bankruptcy. Hence, most of the numbers are from 1918 and 1919 with a few from 1920. I am working on summarizing the information with the goal of being able to look up individual serial numbers like we can in the other 20+ ledgers.