Great Britain
George IV Proof Crown 1821 PR63 PCGS, Royal mint, KM680.2, S-3805, ESC-2317 (R3). TERTIO edge. Beautiful gunmetal gray toning with flashes of blue iridescent luster. The proof 1821 "TERTIO" edge crowns are substantially rarer than their "SECUNDO" edge counterparts. Between NGC and PCGS, a total of 23 proof SECUNDO edge crowns have been graded. This stands in stark contrast to the mere 9 TERTIO edge crowns graded by the two services. This would seem to suggest that the population ratio between the two is about 2.5 : 1. Auction records support this claim, if not suggest an even greater ratio- the last time an 1821 TERTIO edge crown appeared in a sale was back in September 2013, where a cleaned example sold for 2,900 GBP hammer. In that same time period of over three years, more than a half dozen of the 1821 SECUNDO edge crowns have appeared. With all that in mind, this opportunity to acquire such a surprisingly rare British crown should not be taken lightly!
Estimate: 4000-6000 USD