RARE  1973 SILVER METALS INTERNATIONAL 1 OZ. 999 silver round.   Struck by Englehard from U.S. stockpile silver stored at  San Francisco,for distribution by Silver Metals International.  this is by far the rarest U.S. stockpile round, 1st round produced from  U.S. Assay Office silver from the strategic stockpile stored in San Francisco in 1973. Yes, before the c/c assay rounds, Deep rich die strike, top quality production by mint. Don't confuse this round with the Letcher mint knock off. VERY FEW WERE STRUCK. you wont come across these very often, RAREST U.S. SILVER STOCKPILE ROUND KNOWN, thanks