I'm pretty sure it's not a strike through but I really don't know...
My first thought was struck through something very thin, my next thought was etched with some sort of acid somehow in that pattern.
I put it in acetone for 8 hours right after I found it and It didn't change it at all. These pics are after the acetone soak.
Coins are Neato!
"If it's a penny for your thoughts and you put in your two cents worth, then someone...somewhere...is making a penny." - Steven Wright