London Goldsmiths' Company Assay symbol
Precious metals items that have been tested by the London Goldsmiths Company's Assay Office bear the leopard's head hallmark symbol, a tradition that has been around since 1300 and continues to the present.
The Goldsmiths' Company gained its Royal Charter in 1327, although it had been recognised by King Edward I as early as 1300, when he passed a statute requiring that gold and silver of a defined standard be marked with a leopard’s head. This was supposedly taken from the royal arms and later known as the King’s mark.
This is the gateway leading into the former Churchyard of St. John Zachary. The land of the sunken garden is jointly-owned by The Worshipful Company of Goldsmiths and the Diocese of London.