@chronos, sorry but I'm only seeing a silver quarter worn down to the point where the rim is into the tops of the letters in the inscriptions. I would only assign a value corresponding to its weight in silver, with perhaps a little novelty bonus for being so far from home.
"If you climb a good tree, you get a push." -----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz