This database covers official US Army (USA) and Navy (USN) Inspector's Marks on arms and equipment dating from 1790 to 1945. It has been compiled from a variety of printed and online sources as well as our own research. Inspector initials may be difficult to read due to the style of the letters and wear; the Inspector's Mark Search will therefore return all results containing the letter(s) entered. An Arms & Equipment Search will return all inspectors known for the chosen type. To test, type in for example 'ESA'.