Hello, and thank you for any help you can provide.
Many years ago my mother bought me this shell as a gift (I am very interested in military history). I think at the time she said the person who sold it to her said it was WW1 57mm? I am curious if anyone can help me identify it, and most curious if it is dangerous. My wife dropped it on the floor in between us once, and other than leaving a dent in the floor, well, I am still alive to type this, so… there’s that.
Thanks for any help you can provide.