50-zloty coin, 1818 Reverse side

Double-headed eagle under imperial crown; eagle’s chest
features mantle and shield with Kingdom of Poland’s coat of arms
under royal crown. In eagle’s claws, sceptre, sword, and orb. Under
eagle, the minter’s initials: I — B (Jacub Benik).
Below, year: 18 — 18.
Circular legend: 🟋 50 ZŁOT∙ POLSK∙ 26 Z GRZ∙ CZ∙ KOL 🟋
(50 ZLOTYS; 26 COLOGNE MARKS OF PURE GOLD)