A GAME of garden football ended with an historic find by North Devon grandmother Sylvia Nutton.While moving a plant out of harm's way when her three young grandsons started their game at her home in Knowle, Sylvia uncovered a small silver coin. Investigations with the help of Barnstaple library and the Museum of North Devon have revealed that it could be more than 450 years old. The coin is believed to be a Queen Mary I groat dating from 1553-54."I unearthed the coin less than a trowel's depth down," said Sylvia. "One side is in good condition, but the other is a bit scratched. At first we thought it was Edward VI, but the decoration includes the word 'Veritas,' meaning truth, which I understand only applied to groats from the Mary I period. It also has a pomegranate, which was Mary's mint mark. It is quite rare because of the short time that Mary I was on the throne. I am taking it for expert valuation and any benefits will go to my footballing grandsons James, Harry and Archie Tozer, from Ilfracombe."Meanwhile, friend Julian has been invited to carry out a search with a metal detector, just in case the garden may be hiding more.