Brazil
João Prince Regent 960 Reis 1815-R AU53 NGC, Rio de Janeiro mint, KM307.3 ("Rare"), Russo-P425b. An attractive and well-preserved coin, partially lustrous with only slight high-point wear and incipient toning over problem-free surfaces. The very rare variety with the inverted legend "STAB NATA" on the reverse. Very rare in any grade and particularly desirable in this pleasant quality. Only two examples of this issue have been currently certified by NGC, the other an AU58 coin which hammered recently for $12,500 (Stack's Bowers 1/2014, lot 307).
Estimate: 4000-6000 USD