Though my knowledge on the Argentinian Almirante Brown / Veinticinco de Mayo class heavy cruisers are limited based on knowledge on other export designs history it is clear that when the Armada Argentina wished to expand it's fleet, a number of shipyards proposed designs to compete for the build order.
While finally the Italian OTO (Odero Terni Orlando) company built the 2 ships, it was likely that others shipyards, especially Ansaldo and probably the French, American and Japanese Yards produced designs but I have no knowledge about these if any existed and survived the years. None the less as expected the British Vickers firm too offered such a design for a heavy cruiser.
Based on the armament of 7,5"/52 guns this might be the exact specific of the Argentinian order hence the Vickers design too featured such an armament otherwise it most likely to be armed with the 8"/50 guns of the Counties or the 7,5"/45 guns of the Hawkins classes.
Compared to the final ordered ships this design was larger (essentially a reduced scale County or modified York class) and heavier but featuring a very similar armament and might had been much better armoured.
The design had these characteristics:
Dimensions: 173,74m (pp), 184,4m (oa) x 17,17m x 5,03m
Displacement: 8.500ons (Standard)
Engines: 80.000shp Parsons Steam Turbines, 4 shafts
Speed: 62km/h (33,5knots)
Armour: Unknown, probably similar to York so, 38mm Deck over Machinery, 76mm over Magazines, 76mm Belt over Machinery and 111mm over Magazines
Armaments:
3x2 7,5"/52 (190mm/52) OTO Modello 1927 Guns
7x2 4"/45 (102mm/45) QF Mk V DP-AA Guns,
4x1 40mm/39 QF Mk VIII Pom-Pom AA Guns,
2x3 533mm Torpedo Tubes
1x floatplane (I choose Supermarine Seagull)