GREAT BRITAIN. 100 Pounds, 2018. Llantrisant Mint. NGC PROOF-70 Ultra Cameo. Fr-Unlisted; KM-Unlisted. Featuring Britannia and an "oriental" border (in fact, it is a Greco-style maeander pattern border), this one ounce piece is as majestic as can possibly be found. Compare to another specimen designated as a first day of issue, also an NGC PROOF-70 Ultra Cameo, that realized a total of $6,900 [!] in January 2021.
