I detected a local bark chip area that was recently renovated. I was using Field2, all default settings except I raised the threshold from silent to a slight hum. First item found was a 1 inch key, registered 15. Probably fell off a pendant and is pot metal - it has no markings. Then I found a coin on the surface. It registered 17. Checking google, the coin turns out to be a 1 yuan coin that depicts Chiang Kai Shek. If 1984 or 1987 it may be worth $9.99 to collectors.