Launched in 1915, completed in 1916, displacement 450 (surfaced)-548 (submerged) tons, horsepower 900 (surfaced)-680 (submerged), oil fired internal combustion machinery (surfaced) and electric machinery (submerged) and an armament of 1-13pd gun. 4 torpedo tubes and 8 torpedoes.
Source
Archive Dutch Naval Staff 1886-1942 (National Archive at the Hague, Netherlands) inventory number 155. Fleets (the British Empire and foreign countries) on 1 February 1923.
