A late 17th century West Country silver Trefid spoon

A late 17th century West Country silver Trefid spoon, stamped with maker's mark SW twice, for Edward Sweet, Dunster, circa 1690, the oval bowl with a ribbed rat-tail, plain terminal, length 18.3cm, approx. weight 2oz. ** for biographical details of this maker, see Timothy Kent, West Country Silver Spoons and Their makers, 1550-1750, J. Bourdon-Smith Ltd, 1992, page 136.