The coin in question is a 1918 Standing Liberty Quarter minted at the Denver Mint, identified by its 'D' mint mark. This quarter is part of the Standing Liberty Quarters series, which showcases a striking design featuring Lady Liberty on the obverse and an eagle in flight on the reverse. Struck in silver, this quarter has a weight of 6.25 grams and a diameter of 24.3 millimeters. This particular coin's mintage stands at 7,380,000 units, which indicates a moderate level of scarcity. As a denomination of 25 cents (or Quarter), this coin represents a significant piece of United States numismatic history and is cherished by collectors. Given its age and material, the 1918 Standing Liberty Quarter could vary in value based on its condition or grade, with high-grade examples commanding a premium in the marketplace. The coin remains a fascinating representation of American artistry and craftsmanship in coinage, embodying the spirit of its time during the early 20th century.