So, at this weekends military collector show, I got a few neat goodies, as always. One of these neat things was a piece of artillery shrapnel I found in a $1 box. It's once piece of copper with deep rifling. I was looking over it a few minutes ago, and surprisingly I found writing etched in it! It looks like someone scratched the words "mount sect" on the back (I'm pointing at it with a pencil in the pics). Can anyone tell me what it possibly came from, and what "mount sect" could mean?