Launched in 1911, completed in 1912,displacement 300 (surfaced)-330 (submerged) tons, horsepower 1.000 (surfaced)-300 (submerged) hp, oil-fired internal combustion machinery (surfaced)-electric machinery (submerged) and an armament of 2 torpedo tubes and 4 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.