An exquisite mint piece.
The coin is very rare in such a state of preservation.
Obverse: in a laurel wreath the ruler's head to the right, below it the mint's initial C, in the rim the legend:
FRANCISCVS I-D-G--AVST-IMPERATOR-;
Reverse: eagle of the Empire, in the rim legend:
HVN-BOH-GAL-REX-A-A-[20]D-LO-SAL-WIRC-1809-;