Scorped this yesterday at the fairgrounds. Not even sure it's a coin it's so encrusted. Larger than a quarter and a bit smaller than a half. Maybe a bottle cap but larger and a lot heavier. Might be just a slug of some sort or token. Scrubbed it with liquid soap and soft brush initially without making a dent. Soaked it overnight in olive oil and rescrubbed. Still not a dent. Gave it about 4 hours electrolysis this morning with just very little residue coming off. I've zapped a fair number of coins in the past (Roman) but haven't ever seen anything this stubborn. No idea what the metal composition might be. Any suggestions would be appreciated.
http://img827.imageshack.us/img827/3755/b42v.jpg
http://img827.imageshack.us/img827/3755/b42v.jpg