Watch List notes:

Russia 6 Roubles 1831 СПБ St. Petersburg. Nicholas I (1826-1855). Obverse: Crowned double-headed eagle. Reverse: Denomination; date. Lettering: 4 ЗОЛ· 82 ДОЛ· ЧИСТОЙ УРАЛЬСКОИ ПЛАТИНЫ * 6 * РУБЛЕЙ НА СЕРЕБРО 1831 С.П.Б. Platinum 20.71g. Edge ribbed. (Circulation 2 784 pcs.) Bitkin 57 (R2) RARE NGC AU 55 ONLY 6 COINS IN HIGHER GRADE