Mexico
Estados Unidos copper-nickel Proof 20 Centavos 1983-Mo PR68 Ultra Cameo NGC, Mexico City mint, KM442. Mintage: 998. The last date and key of the series.
https://coins.ha.com/itm/mexico/mexico-estados-unidos-copper-nickel-proof-20-centavos-1983-mo-pr68-ultra-cameo-ngc-/a/61313-23297.s?type=DA-DMC-CoinArchives-WorldCoins-61313-03192023
HID02906262019
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