Founded in 1853 in Concord, New Hampshire, the William B. Durgin Co. was purchased by the Gorham Mfg. Co. in 1905. The manufacturing operations were moved to Providence, Rhode Island in 1931. The "D" mark on your nice sterling vase is the later of two marks used by this company. The earlier mark was "WM. B. DURGIN". The "1652" on your vase is likely a product number or inventory number. Hope this helps.