France
Republic platinum Specimen Piefort 50 Francs 1979 SP68 PCGS, Paris mint, KM-P652. From a documented mintage of only 30 pieces. Subtle frost over the devices creates a delicate contrast to the mirrored fields.
https://coins.ha.com/itm/france/france-republic-platinum-specimen-piefort-50-francs-1979-sp68-pcgs-/a/3088-33100.s?type=CoinArchives3088
HID02906262019
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Estimate: 8000-10000 USD