Firing Pin for Enfield P-17 SN 731804. "E" on side for Eddystone. From bolt (2007.016.001b). Rifle, Enfield, Model P-17 Made by Eddystone SN 731804 (Serial number on bolt). Grey parkerizing on rear of bolt. Stamped under arm "SN" "W" On top of arm, US flaming bomb ordnance mark. Often called the "American Enfield" or M1917 Enfield. Officially called the "United States Rifle, caliber .30, Model of 1917. Eddystone was a subsidiary of Remington Arms located at the Baldwin Locomotive Works in Eddystone, Pennsylvania, USA. NOTE: An old accession tag had ripped off leaving the string so it is likely also under an old number.