The coin in question is a 1952 Jefferson Nickel, a United States coin that features a denomination of 5 cents. Designed by Felix Schlag, this particular issue is notable for its proof production type, which means it was struck specially for collectors, resulting in a high-quality finish and sharp detail. This specific nickel measures 21.2 mm in diameter and has a weight of 5 grams. The coin is composed of a material blend consisting of 75% copper and 25% nickel. It does not bear a mint mark, indicating that it was struck at the Philadelphia Mint, as that facility did not use mint marks for proof coins during this period. The mintage of this proof nickel is relatively low, with only 81,980 pieces produced, making it a more sought-after item among collectors. The coin has a plain edge and reflects the classic design associated with the Jefferson Nickel series, which has been in circulation since 1938. Overall, the 1952 proof Jefferson Nickel is a valuable piece of American numismatic history, showcasing the artistry of its design and the craftsmanship of its production process.