This coin is a 1992 proof Jefferson Nickel, minted in San Francisco, designated with the mint mark 'S'. It falls under the denomination of 5¢, which is commonly referred to as a nickel and is also historically known as a half dime. The composition of the coin includes copper and nickel, giving it the distinctive qualities typical of modern U.S. nickels. With a diameter of 21.2 mm and a weight of 5 grams, this nickel is a standard issue for its type. The mintage for this particular coin stands at 4,176,560, which indicates a relatively moderate availability in comparison to other years in the series. As a proof coin, it features a high-quality strike and a mirror-like finish, highlighting the detailed design of Thomas Jefferson's portrait on the obverse and the depiction of Monticello on the reverse. Its status as a proof coin makes it particularly desirable to collectors seeking high-quality specimens. Overall, the 1992 San Francisco mint proof Jefferson Nickel is a noteworthy addition to any collection, embodying both historical significance and the craftsmanship associated with proof coinage in the United States.