the initials may have been the beer & token supplier
I wouldn't be surprised if they were placed in Slot Machines.
Quarter Size ?
Yes, quarter size, but thinner range up like a nickel. Slot machines in bars in PA... I actually knew a guy who operated/managed these. He left a great Fortune 500 company to be the "Collector" and go from bar to bar. He could not pass up the money, wonder what ever happened to him.
the Initials may have been the slot machine Supplier, Or distributor
Responsible for payback to the bar.