Launched in 1919, completed in 1921, displacement 890 (surfaced)-1.080 (submerged) tons, horsepower 2.400-1.600 (submerged) hp, oil-fired internal combustion machinery (surfaced)-electric machinery (submerged) and an armament of 1-4: gun, 1 machinegun and 6 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.
