Greece
Constantine I aluminium Specimen Uniface Trial 50 Lepta 1921 SP62 PCGS, Birmingham mint, KM-TS21. Struck on a large planchet without a collar. Extremely rare, possibly the only example extant, faint ghosting of a previous strike evident beneath the design.
https://coins.ha.com/itm/greece/greece-constantine-i-aluminium-specimen-uniface-trial-50-lepta-1921-sp62-pcgs-/a/3081-30904.s?type=CoinArchives3081
HID02906262019
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Estimate: 2000-3000 USD