Chinese Trading Plates possibly made of silver

I am not sure what these are? The person I purchased from said he thought they were used circa 1600-1700 in China for trading purposes. They are small and heavy and seem to have been cleaned. I am not sure if they are silver and not sure what they are. Can you help?

57980-1 57980-2

Mona Novotny
Hobbyist - Powell Butte, Oregon
October 3, 2011

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