The series Military Historical Files, 1945-1962 in Record Group 156 contains 2 files related to the 'caliber. 1955 in Records Group 156 that contains 3 files related to the 'caliber. Next, we located the series Rock Island Arsenal and Springfield Armory Manufacturing Description Files, ca. If such lists were prepared by the Office of the Chief of Ordnance, they were not transferred to the National Archives with the older records of that office. Please note that we are unable to locate any prepared lists showing the serial numbers of weapons purchased and issued by the United States Army.

Please contact the National Archives at Boston (RE-BO) at for access to these and similar records. We also located the series Reports of Tests of Ordnance and Proceedings of the Boards Making the Tests, 1864-1905 that may contain some information about the Eddystone. We searched the National Archives Catalog and located the series Experimental Reports, 1915-1934 in the Records of the Office of the Chief of Ordnance (Record Group 156) that contains 2 files related to the 'Model of 1917 Eddystone' that may be relevant to your research. Under normal War Department records management procedures, such documentation would be destroyed after initial administrative use. Military records in the custody of the National Archives do not include the record of assignment and operational activity of individual pieces of equipment. Thank you for posting your request on History Hub!

1917 enfield eddystone serial numbers