.999 Round minted as 2004 Buffalo, .999 Round minted as 1776 Continental Dollar, 1970 100th Anniversary of The America's Cup (27 grams sterling silver), 1976 Armenian American Contribution to the Bicentennial (Medallic Art Co .999 Silver 26.7 grams), 2000 Kiribati 10 Dollars The New Millenium (.500 22 grams); 2000 Kiribati 20 Dollars sterling (.636 oz), Israeli 1991 Aliya Proof (Sterling 28.8 Grams).