The unusual coin
The unusual coin

A 50p coin engraved with a microscopic message has been sent to King Charles congratulating him ahead of the coronation.

University of Nottingham researchers have milled the names and coronation dates of all the Windsor monarchs from George V to King Charles using a special electron microscope.

The coin was set in a floating coin holder engraved with the university’s logo.

The Nanoscale and Microscale Research Centre (nmRC) team used a Focussed Ion Beam Scanning Electron Microscope usually for cutting into surfaces to see their microscopic makeup.

Materials Characterisation Technician Dr Nigel Neate said: “The width of the inscription is around 30 to 35 microns, which is about half the width of a human hair.

“And we chose the space next to the back of the neck of King Charles because it was a flat area for us to put the inscription. The actual milling for this commemorative piece we’ve produced took a little over half an hour.”