Displacement 364 (surfaced)-434 (submerged) tons, horsepower 3.648000 (submerged)-320 (surfaced) hp, oil-fired internal combustion machinery (surfaced)-electric machinery (submerged) and an armament of 4 torpedo tubes.
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.
