Collectible coins, such as the 2007 United States One Dollar Proof Set, feature specially minted coins that showcase superior quality and craftsmanship. These proof sets include multiple coins struck with polished dies, resulting in a shiny and mirror-like finish. The 2007 set typically includes coins honoring various themes or historical events, aimed at collectors and investors alike. Proof coins are often manufactured in limited quantities, increasing their appeal and value in the numismatic market.

Item Denomination Series Year Mint
2007-S $1 Presidential Proof Set 4 Coins $1 (One Dollar) Proof Sets 2007 San Francisco