This is for one 1926 S Standing Liberty Quarter, as pictured. 1926 S is a less common date and mint for the Standing Liberty Quarters minted between 1925 and 1930 (1925 was the year a design change was implemented to reduce the amount of wear on the dates).
Standing liberty quarters are notoriously worn coins with many of the high relief features worn off during circulation. The result is that many of the coins no longer have a date visible.
History:
The Standing Liberty quarter is a 25-cent coin that was struck by the United States Mint from 1916 to 1930. In 1915, Director of the Mint Robert W. Woolley began steps to replace the Barber dime, quarter, and half dollar, as he mistakenly believed that the law required new designs. Eventually, the result was this design issued soon after.
In circulation, the coin's date wore away quickly, and Mint engravers modified the design in 1925 to address the issue. The Standing Liberty quarter was discontinued in 1931, a year in which no quarters were struck. By Congressional act the Washington quarter, featuring the first president's profile, was introduced in 1932 to celebrate the bicentennial of his birth.
Great Depression Era Coin
1926 S Standing Liberty Quarter - Good Condition - Silver Coin - 1926-S Standing Liberty Silver Quarter - San Francisco Mint Mark