USA (Philadelphia mint), 25 cents Standing Liberty, 1916, very rare key date, encapsulated NGC XF 45. KM-141. Lightly toned all over, hints of luster, desirable first date (only 52,000 struck) in a moderate grade that gets quite a bit more expensive in AU and Mint State (up to about $40,000).
Estimate: $10000 - 15000