Part of the Veinticinco de Mayo-class consisting of the Veinticinco de Mayo and the Almirante Brown, using a modified simplified Italian Trento-class cruisers design. There were 3 planned to be built, but one was cancelled. Laid down at Cantieri navali Odero, Genioa-Sestri Ponente, Italy on 12 October 1927, launched on 28 September 1929, commissioned on 18 July 1931, decommissioned on 27 June 1961 and sold to be broken up in Italy in 1962.
With a displacement of 6.800 (standard)-9.000 (full load) tons and as dimensions 171 x 17,82 x 4,66 metres or 561’0” x 58’6” x 15’3”. The machinery consisted of 2 shaft Parsons turbines and 6 oil-fuelled boilers supplying 85.000 shp allowing a speed of 32 knots. With a speed of 14 knots was the range 8.030 nautical miles. Crew numbered 780 men. The modest armour consisted of a 7cm/2.75” thick belt, a 2,5cm/1” thick deck with the gun turrets and conning tower protected by respectively 5cm/2” and 6cm/2,3”. The armament consisted of 3x2-19cm/7.5” 52cal guns, 6x2-10,2cm/4’ 40 call dual purpose guns (later replaced by twin 4cm Bofors), 6-4cm/1.57” Vickers-Terni anti aircraft guns and 6-53,3cm/21” torpedo tubes. Carried 2 Grumman J2F Duck floatplanes for which a catapult launcher was available.
