Russia, Empire. Alexander I AR Rouble. St. Petersburg mint, 1820/19. Crowned double-headed eagle facing with wings spread, wearing shield on breast depicting St. George slaying the dragon, and holding sceptre and orb; crown above, П-Д across lower fields, denomination and date around / Issuing body and denomination in four lines, C.П.Б. below; crown above, wreath around. Edge inscription: • СЕР • 83 1/3 ПРОБЫ 4 ЗОЛ • 82 14/25 ДОЛИ. Bitkin - (overdate not listed), cf. 130.

NGC graded MS 62 (#4236783-006); none graded higher by NGC - Top Pop. Very Rare; Bitkin makes no mention of this apparent overdate.

From the GK Collection (France) of Russian Coins;
Ex Antykwariat Numizmatyczny - Michal Niemczyk, Auction 9e, 7 May 2016, lot 708.

The reverse die for the present rouble was used for two consecutive years, with the date being re-cut to read 1820 from the original 1819, as can be seen clearly here.