Caracas, Venezuela, 4 reales, Ferdinand VII, 1819 BS, castles and lions in proper quadrants, very rare, NGC XF 40. Cal-1027; KM-C7.2; Stohr-12. 10.22 grams. All details full except for rims, with light even toning all over, very rare and highly sought type known as a "toston," usually found holed or at least damaged (which this is not), and made in small numbers, this example in fact second finest in the current NGC census behind a single AU 58.
Estimate: $3000 - $4500