A nice fully legible piece.
The last gold coin of the Warsaw Principality, occasionally found on the market in good state of preservation.
Obverse: bust of the prince to the right, in the rim legend:
FRID-AVG-REX SAX.DVX VARSOV;
Reverse: crowned coat of arms of the Duchy of Warsaw on two palm branches, date 18-14 at top, initials I.-B. at bottom and denomination 1/6 TALARA