Mexico
Estados Unidos gold 20 Pesos 1959 MS67 PCGS, Mexico City mint, KM478. Most likely a restrike, though not designated as such on the holder. AGW 0.4822 oz.
https://coins.ha.com/itm/mexico/mexico-estados-unidos-gold-20-pesos-1959-ms67-pcgs-/a/3083-32665.s?type=CoinArchives3083
HID02906262019
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Estimate: 750-800 USD