Brazil
Maria I & Pedro III gold 6400 Reis 1778-R AU Details (Removed from Jewelry) NGC, Rio mint, KM199.2. Polished fields and likely mounted at 12:00, although not possible to say for certain as the coin is in the NGC holder. Just minimal wear visible however. AGW 0.4229 oz.
HID02901242017
Estimate: 600-800 USD