1921 Standing Liberty Quarter. MS-66 (NGC). CAC. Olive and argent-gray combine with speckles of apricot iridescence on both sides of this delightful Gem. A very scarce issue in all grades. Perhaps 1,000 to 1,500 Mint State examples still exist, of which the median grade for certified coins is MS-64 or thereabouts. Survivors grading MS-66 or finer are very rare amounting to just a few dozen pieces, all told.