King William III Copper Farthing Dated 1700 found metal detecting East Hampton CT 11/19/2016

My honey hole field gave up 2 gold and 2 silver and one Copper Farthing in the last 4 weeks. How did that 1700 farthing get there? This hobby continues to get better every day I do it. Good Luck and Happy Hunting. The farthing was 9 inches down.