"The official bullion coin of the USA, now being offered as a hollow spy coin. When solid, the American Silver Eagle coin is one troy ounce of .999 fine silver, and measures 40.6mm in diameter, and is 2.98mm thick, which is considerably larger than the US silver dollars.

To keep the weight of this coin as close as possible to original, the cavity cut into this coin will only be large enough to house a MicroSD memory card."