Russia
Nicholas I platinum 3 Roubles 1829-СПБ AU50 NGC, St. Petersburg mint, KM-C177, Bit-74 (R). Rubbing on the high points, with considerable remaining mint luster. Minor flan flaws on the reverse, as struck, are visible under magnification. Very scarce.
https://coins.ha.com/itm/russia/russia-nicholas-i-platinum-3-roubles-1829-and-1057-and-1055-and-1041-au50-ngc-/a/3082-34704.s?type=CoinArchives3082
HID02906262019
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Estimate: 1500-2000 USD