Atlantic Salmon 50p (2023)

This is the King's definitive 50p, the standard everyday design rather than a commemorative: an Atlantic salmon beside a pattern of interlinked letter Cs for Charles. Only 200,000 of the 2023-dated coins went into circulation, fewer than the famous Kew Gardens coin, and Change Checker's scarcity update in late 2025 moved it to the top of its index as the scarcest 50p in circulation. Read the date before celebrating: because the salmon is the standard design it keeps being struck, with 2 million dated 2025, so only the 2023 date counts as the find.