10 COINS. UNITED STATES. Mercury dime set, the earliest years. 10 different pieces in plastic capsules ranging from average circulated to EF. They all have clear dates and few problems other than honest wear. 1916 (F); 1917 (aF); 1918 (VF); 1919 (VF); 1920 (F); 1921 (Key, well worn, G4); 1923 (lustrous Uncirculated); 1924 (aF); 1925 (aVF); 1927 (F).