Finally found some time to do a quick search on a field near HD.
2 1924 Coins. A Zinc one how we find them here and a, i guess, bullet (10mm diameter and 20mm long). Could not find any confirmation through pictures in the internet yet.
Mac
Welcome, neat finds. You are correct about that being a bullet in the third picture; we have some similiar to that in the U.S. The thing on the left might be a fired bullet as well.
-Jason