Spain
Isabel II bronze Proof Pattern 25 Centimos 1854 PR64 Brown NGC, cf. KM615.2. Plain edge. 9.41gm. Extremely rare, a marvelous prototype with an approaching cameo-worthy portrait of Isabella in contrast to the blue-tinged reflective fields behind.
https://coins.ha.com/itm/spain/spain-isabel-ii-bronze-proof-pattern-25-centimos-1854-pr64-brown-ngc-/a/3081-31231.s?type=CoinArchives3081
HID02906262019
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Estimate: 2000-2400 USD