The Royal Observatory, which originally passes through the Prime Meridian (0 degrees longitude), is the Greenwich Observatory, which is also taught in schools. This year marks the 350th anniversary of the establishment of this observatory in 1675, and a beautiful silver proof £2 coin has been released by the Royal Mint. This coin stimulates the scientific mind. It has never been taken out of its plastic case. Weight: 12.00 g, Diameter: 28.40 mm Made of sterling silver, it is a limited edition of 1500 coins worldwide.