The Isle of Man has issued sovereign-sized gold pieces under its own authority since the 1970s, operating entirely outside the Royal Mint's remit — which allows it to attach commemorative designations to the sovereign format that London would never sanction for a British issue. Prince William turned 40 on June 21, 2022, roughly two months after the Queen's Platinum Jubilee celebrations had already saturated the commemorative market.
The Isle of Man has issued sovereign-sized gold pieces under its own authority since the 1970s, operating entirely outside the Royal Mint's remit — which allows it to attach commemorative designations to the sovereign format that London would never sanction for a British issue. Prince William turned 40 on June 21, 2022, roughly two months after the Queen's Platinum Jubilee celebrations had already saturated the commemorative market.