A Charles 11 silver crown (second bust edition) recovered from the wreck of the HMS Association, dated 1670. HMS Association was a 90-gun second-rate ship of the line of the Royal Navy, launched at Portsmouth Dockyard in 1697. She served with distinction at the capture of Gibraltar, and was lost in 1707 by grounding on the Isles of Scilly in the greatest maritime disaster of the age. 
The coin is one of the first examples of mill striking as production moved from traditional hammer struck coins. It is made in .925 Sterling Silver. The year is on the edge in Latin words. Measures 38mm. Comes with its Certificate of Authenticity.