Ionian Islands, 1821 copper Lepton, crude localised issue

Ionian Islands, copper Lepton, 1821, crude local issue probably struck over a Turkish copper coin, Venetian lion left, date below, Greek legend and toothed border, IONIKON KPATOΣ, rev. inverted die axis, Britannia seated left on globe with shield, holding trident and olive branch with berries, 4 in exergue, 1.85g (Pr.22; KM 30). Corroded with dark toning, a bold fine for this very rare issue.