1959 - Not sure

[Pat]

I ran across this tonight..The edges are sharp and flat.. It's a weird one..

[car10]

Possibly a proof coin that escaped into circulation. Nice find.

[Pat]

But proof don't they usually have a sqaured off obv/rev edge? Which I see now looking at it.. But then it seems to have an extra edge around it that is like a blade..:)