Russia
R.S.F.S.R. Proof 10 Kopecks 1922 PR67+ NGC, Leningrad mint, KM-Y80. Obv. National arms. Rev. Date and value in beaded circle. Bold details, with pure white surfaces. The fields are deeply mirrored and the devices cameo. No example of this issue has received a higher grade.
https://coins.ha.com/itm/russia/russia-rsfsr-proof-10-kopecks-1922-pr67-ngc-/a/3081-31189.s?type=CoinArchives3081
HID02906262019
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Estimate: 2000-2500 USD