Russia
Nicholas I gold 5 Roubles 1852 CΠБ-AГ UNC Details (Mount Removed) NGC, St. Petersburg mint, KM-C175.3, Bit-35. Rather than a "Mount Removed," it appears that there is an attempted piercing on the obverse at 12 o'clock.
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https://coins.ha.com/itm/russia/russia-nicholas-i-gold-5-roubles-1852-cand-928-and-1041-aand-1043-unc-details-mount-removed-ngc-/a/3076-34544.s?type=CoinArchives3076
HID02906262019
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Estimate: 400-600 USD