Spain
Isabel II 20 Reales 1850 S-RD AU55 NGC, Seville mint, KM592.2. A fleeting representative of the Seville-minted issue carrying both the "S" and "RD" on the reverse to distinguish the type from its much more common Madrid-minted counterpart of the same date. Lightly toned with glints of underlying luster, this example remains the only one yet certified by NGC.
https://coins.ha.com/itm/spain/spain-isabel-ii-20-reales-1850-s-rd-au55-ngc-/a/3088-35145.s?type=CoinArchives3088
HID02906262019
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Estimate: 2000-3000 USD