Prestige proof sets are the rarest form of U.S. proof sets. Low-mintage Prestige Proof Sets include one-year-only commemorative proofs as well as the five regular proof coins. This final year 6-coin 1997 set includes the Botanic Garden silver dollar as well as the five regular U.S. circulating issues. All are minted in finest-quality proof form. A mere 80,000 were produced, just 4% of the regular proof set mintage that year.