Ireland
Republic 1/2 Crown 1943 XF40 NGC, London mint, KM16, S-6633. The rarest of all halfcrowns within the series, with an estimated 500 pieces of the original issue of around 1,000 specimens believed to be extant. In grades of XF or higher, such as this example, it becomes even more difficult to encounter.
Estimate: 1300-1600 USD