Part of the Royal Mint Annual Commemorative set.
 
Commemorating 350 years of the Greenwich Royal Observatory home of Greenwich Mean Time. 
 
*This coin has not been released into general circulation*
 
Obverse: Martin Jennings (King Charles Portrait)
Reverse: depicting the Shepherd Gate Clock, the constellation Ursa Minor, the star Polaris and the Prime Meridian shown on a globe (designed by Henry Gray)