Mexico
Estados Unidos Mule Onza ("Libertad") 1999-Mo MS66 NGC, Mexico City mint, KM613. A very rare mule issue featuring the obverse (national arms) of the year 2000 Libertad paired with the reverse (Winged Victory) of the 1999 issue. This error appears to be rare enough that it took a number of years for the collecting community to take notice, with Coin World debuting an article titled "Mule error discovered in Mexico's Libertad bullion series" only in 2015. Only a few remain known, rendering the present offering a scarce if not unique chance for the majority of our bidders.
https://coins.ha.com/itm/mexico/mexico-estados-unidos-mule-onza-libertad-1999-mo-ms66-ngc-/a/3083-30486.s?type=CoinArchives3083
HID02906262019
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Estimate: 3000-4000 USD