This is a recording of a workshop given at the 2014 AFTE (Association of Firearm and Toolmark Examiners) conference in Seattle, on the subject of proof marks and other identifying marks on firearms, specifically arms made between roughly 1880 and 1945. I am available to present classes on this and other topics related to historical firearms to police and law enforcement agencies, collectors' groups, trade associations, and other interested groups. For details, please contact me at admin@forgottenweapons.com .