You also have some very old one (Kreuzer) from the "Kaiserreich".
In my area you can find a lot of metal from the roman impire and even the keltics. We have some ot the headquarter of Hitler just in my forrest behind my house.
The US. Army blew these bunkers up and all the scrap flew in a wide range around it. I have found ammo from anti-aircraft-guns, metal pieces from roman soldier´s equipment so far and some unidentified metal scrap pieces, that look like from crashed planes.
I read that in east germany you can hunt for metal in small, shallow lakes. Many items were thrown into them as the russians advanced towards the west.
My grandparents who lived in eastgermany (Pommern) which is now a part of poland, dug a hole and put all their silver spoons etc in there. Many families have done that, afraid they would be robbed on their trail to the west. But as they never came back, there is lot to be found in the soil of eastgermany.
Marcel