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This is the 2023 BU issue (PM mint) with a mintage of 175. The Charles III Mercury Glacier coin, issued in 2023 by the British Antarctic Territory, represents a notable addition to modern numismatics, particularly due to its striking design and limited mintage of only 175 pieces. Crafted by the Pobjoy Mint, this £2 silver coin showcases an intricate depiction of the Mercury Glacier, symbolizing both the beauty and fragility of the Antarctic environment, while also featuring a gold plated outer ring that enhances its visual appeal. As the first coin featuring the portrait of King Charles III, it holds significant historical value, marking a transition in British coinage that collectors are keen to acquire. The rarity score of 10 out of 10 underscores its desirability among numismatists, making it a coveted piece for those interested in modern commemorative issues and environmental themes, as well as royal portraiture.