The coin in question is an exquisite example of the Seated Liberty Half Dollar series, specifically minted in 1891 at the Philadelphia Mint, denoted by the mint mark 'P'. This particular piece is a Proof coin, which signifies its higher quality and limited production runs as compared to standard circulation coins. With a mintage of only 600 pieces, it is a rare find for collectors. This Half Dollar has a denomination of 50 cents and is composed of silver, making it not only a beautiful collectible but also a piece of American history. The coin measures 30.6 mm in diameter and weighs 12.5 grams. Unfortunately, width and height are not specified in this context, but standard specifications for coins typically consider those dimensions negligible concerning circulation. Beloved by numismatists, the Seated Liberty design features a striking image of Lady Liberty seated, symbolizing freedom and strength, along with intricate details that reflect the artistry of the era. The 1891 Seated Liberty Half Dollar is a noteworthy piece for any collection, representing both the era's craftsmanship and the historical context of its minting. The combination of its low mintage, premium Proof quality, and silver composition contributes significantly to its desirability and collecting value within the numismatic community.