Greece
Constantine I aluminum Specimen Uniface Trial 50 Lepta 1921 SP62 PCGS, Birmingham mint, KM-TS21. Struck on a large planchet without a collar. An intriguing and extremely rare trial strike, one of very few examples known.
https://coins.ha.com/itm/greece/greece-constantine-i-aluminum-specimen-uniface-trial-50-lepta-1921-sp62-pcgs-/a/3085-31698.s?type=CoinArchives3085
HID02906262019
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Estimate: 1500-2000 USD