Great Britain
George IV Shilling 1821 MS67 PCGS, Royal mint, KM679, S-3810. The single finest graded example at PCGS, and tied with one other at NGC at the 67 level. The red dot seen on the reverse is actually on the holder itself, rather than the coin, so that should be ignored. Beautiful chestnut toning with significant luster. A piece that has clearly been treated with the utmost care over the course of the last two centuries.
Estimate: 2000-3000 USD