I'm curious about the triangular marks myself.
Seeing them quite often on many dollar and crown size fakes from China.
But this coin doesn't seem to fit in with all those others I'm talking about.
I had one theory about maybe another coin edge causing that mark- but I'm not so sure if that is true.
Another theory was marks left by a tool picking up a freshly hot molded fake- but that's another idea perhaps down the wrong path.