While out metal detecting on our private permission in Somerset (UK) we found five 20mm shell casings all dated the same 1943 and all with the same manufacturers stamp. Here’s the best one below. My question is does anyone have any idea, who made them and what fired them? I have heard everything from Spitfires, Hurricanes, B17’S, to Anti Air on the ground. A bit of basic reasearch hasn’t made things any clearer. Locally there was no AA stationed at the site they were found on, (Near Weston-Super-Mare UK) and the casings were all found in line over three fields, so obviously fired from an aircraft as it went over, but does anyone know what type of aircraft? The local WWII squadron was made up of Hurricanes, but i’m told the casings are American. If that’s the case, it would seem slightly out of place in rural UK circa 1943. (As a new user i can only post one image, so here’s the bottom of the casing. Overall each shell casing is 5 inches long.