A nice piece.
Obverse: the ruler's head to the left, in the rim the legend:
CZAR-FELIX D-G-REX SAR-CYP-ET HIER- 1828;
Reverse: on a laurel and oak wreath a coat of arms, in the rim legend:
DVX SAB-GENVAE ET MONTISF-PRINC-PED-&- L-20;;
Gold .900, weight 6.41 g.