This object, measuring some 2.5 cms in diameter is a MEDIEVAL JETON or reckoning counter used for adding up and doing simple mathematics in times when most of the labouring classes were illiterate. They date from the 15th century to the end of the 17th and were in the main imported from France. This one, found by a Friends’ member in Chelmsford bears the inscription “Ave Maria Gracia Plena” (Hail Mary full of Grace).