Portugal
João VI gold 6400 Reis (Peça) 1826 AU Details (Obverse Cleaned) NGC, Lisbon mint, KM378, Fr-134, Gomes-9.01. A scarcer date, from a mintage of only 10,883 pieces. Faint friction to the high points of the devices accounts for the About Uncirculated grade, but the overall appearance is that of a Mint State specimen, with fully intact, watery luster in the fields. Evidence of a prior cleaning is visible via wispy hairlines in the obverse fields, but they have been nicely toned over and are not especially distracting.
Ex. Numismatica Genevensis Auction 2 (November 2002, Lot 916)
https://coins.ha.com/itm/portugal/portugal-joao-vi-gold-6400-reis-peca-1826-au-details-obverse-cleaned-ngc-/a/3096-30431.s?type=CoinArchives3096
HID02906262019
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Estimate: 1000-1500 USD