1971-1973 Eisenhower $1Silver "Blue IKE's" 15 pcs total. Struck at the San Francisco Mint and made of silver, you get 5 from each year, 1971, 1972, and 1973. Housed in their original Registered Envelope from the US Mint, these haven't seen the light of day in decades! These are the ones that are of the silver composition, struck and packaged specially for collectors. Each coin is in its blue envelope of issue. The 1973 is the scarcest year of the IKE dollar series.