Russia
Alexander I 10 Kopecks 1805/4 CΠБ-ΦΓ AU55 NGC, Banking mint, KM-C119, Bit-65 (R; overdate unlisted), Sev-2553 (same). By all indications a very rare overdate of unrecorded mintage, pleasantly toned with a soft sapphire and amethyst color.
https://coins.ha.com/itm/russia/russia-alexander-i-10-kopecks-1805-4-cand-928-and-1041-and-934-and-915-au55-ngc-/a/3083-32728.s?type=CoinArchives3083
HID02906262019
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Estimate: 400-600 USD