Launched in 19, completed in 19, displacement 413 (surfaced)-557 (submerged) tons, horsepower 1.300 (surfaced)-900 (submerged) hp, oil-fired internal combustion machinery (surfaced)-electric machinery (submerged) and an armament of 1-14pd gun and 8 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.
