5 Pounds - Charles III The Penny Drops (2026)

About the 2026 5 Pounds - Charles III The Penny Drops

The 2026 5 Pounds - Charles III The Penny Drops is a collector 5 pounds coin, struck in copper-nickel. It weighs 28.28g and measures 38.61mm across. Reverse design: A depiction of four compass points, and a planetary map around a sun, featuring a latent feature, surrounded by a ring of 26 symbols accompanied by the inscription.

Common questions

History and design

The Penny Drops is a £5 crown built as a puzzle. The Royal Mint unveiled it on 29 January 2026 at the Science Museum in London, where the mathematician and broadcaster Bobby Seagull was given the first coin struck and named Player One of The Great British Treasure Hunt. The Mint describes the coin as a physical decipher: numbers, letters and symbols in its design, used with its packaging, unlock layers of riddles across the hunt's five levels.

The hunt was inspired by Sir Isaac Newton, Master of the Mint for nearly 30 years. The Royal Mint called it the first time a UK coin had been used as the key to a national challenge. Level 1 was free to play; later levels were unlocked with the coin and its packaging. UK residents aged 18 or over who finished every level by 30 March 2026 were entered into a draw for a single prize, a 250g solid gold bar. The competition has closed, though the puzzles can still be played for fun.

The reverse is by Christian Davies and Matt Dent, who also designed the Royal Mint's James Bond crowns. The proclamation describes four compass points and a planetary map around a sun, with a latent feature, surrounded by a ring of 26 symbols and the inscription THE PENNY DROPS with the date. The edge is plain with the incuse inscription STANDING ON THE SHOULDERS OF GIANTS, and the proclamation directs that indicated letters within it are inverted.

The obverse carries Martin Jennings's portrait of King Charles III with the inscription CHARLES III D G REX F D 5 POUNDS.

Varieties and errors

Inverted letters on the edge are part of the authorised design, set out in the proclamation, and are not a mint error. No other varieties or errors are documented.

Collecting notes

The Royal Mint says the coin was launched in Brilliant Uncirculated, silver and gold editions and would not go into general circulation. No struck or sold figure has been published for the Brilliant Uncirculated coin. The silver proof has a maximum coin mintage of 5,010 and the gold proof 110, both issue limits.

The packaging is part of the puzzle, so a complete example keeps its pack. Check that the edge lettering is clean and that the 26 symbols on the reverse are sharp.