Brazil
Joao Prince Regent 640 Reis 1811-R Inverted Reverse, KM256.2, Russo-413a, XF45 NGC, very rare variety with the reverse rotated 180 degrees. Nicely toned with bold details, small rim bruise at 5 o'clock. Krause catalog price(s) for this item: $45 in VF, $75 in EF.
Estimate: 6000-8000 USD