1 oz silver fake kookaburra coin

In this test I demonstrate using magnets, specific gravity, and destructive testing to show a fake Australian kookaburra. This was bought on ebay 121012. In all fairness, the seller refunded my money. The American Silver Eagle and the Kookaburra are almost exact in diameter however the kook is much thicker this is needed for it to weigh correctly. According to online sources, this coin is White Copper a 75 copper alloy with nickel and zinc this would give the specific gravity I f