Francis Bannerman is really the father of the modern military surplus industry, and in many ways a father of gun collecting as we know it today. Before Bannerman, “gun collecting” was generally something for the wealthy and revolved around fancy and bespoke guns. It was not about have representative pieces of normal arms, it was about having the fancy and exclusive things. Bannerman changed that by offering all manner of ordinary surplus at affordable prices to anyone who was interested. In addition to complete guns and other equipment, Bannerman also dealt in huge numbers of bits and pieces, and sometimes assembled them into various odd hybrid guns for sale, which we still see occasionally today…
Sample Bannerman catalog (1903):
https://archive.org/details/francis-bannerman-military-goods-catalogue-1903/
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