From the August 1, 1923 Gorham Catalog, this pattern is described as, "As its name implies, the St. Dunstan is a pattern which, by its massive strength and virile outlines, recalls the handiwork of the silversmiths of olden times. In addition to these noble qualities, however, it is characterized by a refinement and delicacy of detail and finish which are only rendered possible by the ingenious appliances at the service of the modern silversmith."
The pattern was issued in 1917. The only source I could find said it was discontinued in 1991.
(Place Fork 7 3/8 inches)
(Orange Spoon 5 3/4)
(Bon Bon Spoon 4 7/8 inches)
(Lemon Fork 5 5/8 inches)
(2 Piece Salad Set 8 3/4 inches)