Watch List notes:

British Milled Coins from Various Properties

Elizabeth II (1952-2022), Decimal issues, Twenty Pence, 1993 (cf. S G2A). Struck in copper-plated steel (instead of cupro-nickel), virtually mint state, an interesting error and presumably extremely rare £300-£360

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Sold with a letter of authentication from the Royal Mint, Llantrisant, dated 12 December 1994