Hi all.. new to this site so take it easy on me I was recently in Normandy touring the beachheads and on Omaha Beach my 12 year old son found what I think is possibly a large bore (extremely rusted) barrel along the base of the cliff. Extending what I have it seems that it would be approx. 60mm wide with a 40mm bore with 10mm wall thickness. It has large cracks running through it and has been smashed up. It has distinctive lines running around the opening as the pictures show below... anyone have any ideas.. hard to get proper pictures but see my best attempts below. What we have is about 17cm long but it was obviously much longer. Thanks in advance.. he would love to take this to his history class so any information would be greatly appreciated.