Germany
Democratic Republic 20 Mark 1966 MS64 NGC, KM16.1. Anniversary of the death of Leibniz. Near-gem surfaces with a light tone.
https://coins.ha.com/itm/germany/germany-democratic-republic-20-mark-1966-ms64-ngc-/a/61272-97445.s?type=DA-DMC-CoinArchives-WorldCoins-61272-05292022
HID02906262019
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