Cant quite make out the counterstamp, but the first letter looks like an A. Theres pages on counterstamps otu there which show which coins host which stamps, might be worth a look.
Also, its nice to have someone else on the forum who is a fan of these chewed up low grade coins. I have quite a few which would be sitting unloved in a dusty box somewhere awaiting melting if I didnt have them. The cull piles often contain some really nice and rare stuff.