An early 17th century West Country Wrythen Knop spoon

An early 17th century West Country Wrythen Knop spoon, maker's mark thrice to stem and once with town mark to bowl, marks worn possibly Robert Mathew of Barnstable circa 1630, tapering faceted stem, the reverse of the bowl with prick-dot initials 'W.B', length 15.5cm, approx. weight 0.9oz.