Russia
R.S.F.S.R. Proof 15 Kopecks 1923 PR67 Cameo NGC, Leningrad mint, KM-Y81. Blazing white, with sharply struck details and only a few, barely noticeable, minute marks. None have been certified finer by NGC.
https://coins.ha.com/itm/russia/russia-rsfsr-proof-15-kopecks-1923-pr67-cameo-ngc-/a/3076-32171.s?type=CoinArchives3076
HID02906262019
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Estimate: 2000-2500 USD