1856 S 25C Seated Liberty Quarter Extra Fine XF Key Date Tough Grade S Mint R469. This 1856 S key date liberty seated quarter has an excellent strike with sharp extra fine details. It has a low mintage of only 286,000 and is very difficult to find in extra fine or better condition. Please check this listing page carefully as the answer is usually there.The item "1856 S 25C Seated Liberty Quarter Extra Fine XF Key Date Tough Grade S Mint R469" is in sale since Thursday, August 22, 2019. This item is in the category "Coins & Paper Money\Coins\ US\Quarters\Seated Liberty (1838-91)". The seller is "westcoastcoinsoregon" and is located in Toledo, Oregon. This item can be shipped to United States.