Argentina
Republic brass Proof Essai "Lucien Bazor" 50 Centavos 1940 PR63 NGC, Paris mint, KM-Pn54 var. Struck in brass rather than the more typical nickel issues, this scarce pattern features the full name of the famous French engraver Lucien Bazor beneath the bust of Liberty.
https://coins.ha.com/itm/argentina/argentina-republic-brass-proof-essai-lucien-bazor-50-centavos-1940-pr63-ngc-/a/3083-32202.s?type=CoinArchives3083
HID02906262019
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Estimate: 300-500 USD