Russia
Nicholas I Proof 25 Kopecks 1836 СПБ-HГ PR63 NGC, St. Petersburg mint, KM-C166.1, Bit-277 (R). Narrow bow. Obv. Crowned Imperial eagle in beaded circle. Rev. Crowned date and value in wreath. The strike is excellent, with mottled russet, blue, and gray toning over fully mirrored fields. Only a few minor marks are noted on the obverse and reverse. An extremely rare Proof issue and the only example certified in Proof by NGC and PCGS combined.
https://coins.ha.com/itm/russia/russia-nicholas-i-proof-25-kopecks-1836-and-1057-and-1055-and-1041-hand-1043-pr63-ngc-/a/3076-32136.s?type=CoinArchives3076
HID02906262019
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Estimate: 2000-2500 USD