50 Pence - Charles III Buckingham Palace, Gold Proof

Buckingham Palace as a coin subject has a specific bureaucratic history: the Crown Estate technically owns the palace, but it was transferred to public management under the Sovereign Grant Act 2011, which replaced the Civil List and tied royal funding directly to Crown Estate profits. Jersey, as a Crown dependency outside the UK parliament's direct jurisdiction, issues its own coinage under royal sanction — a prerogative arrangement that has produced a flood of precious-metal commemoratives in recent decades, largely targeting collector rather than circulatory demand.

The 15.5g target weight places this squarely in the half-sovereign format by mass, a deliberate choice for gold proof issues at this price point.