10 Zlotys 2012 UEFA European Football Championship

Poland co-hosted UEFA Euro 2012 with Ukraine — the first time the tournament was held in Eastern Europe. The decision, awarded in 2007, was deeply contentious; both nations faced sustained skepticism about infrastructure readiness, and Poland accelerated a nationwide stadium and motorway program specifically to meet UEFA deadlines. Warsaw's National Stadium was completed just months before kickoff.

Y#825-828 indicates four distinct pieces in the series, each issued for the same event under separate catalog numbers — almost certainly reflecting different host city reverses or sequential match-phase designs rather than a single type.