Used on the only "Treaty" cruisers ever to serve in a South American Navy. Built by OTO at La-Foce and Livorno, Italy, these cruisers were considered to be very successful.

Gun Characteristics

Designation 7.5"/52 (19 cm) OTO
Ship Class Used On Veinticinco de Mayo class
Date Of Design 1927
Date In Service 1931
Gun Weight N/A
Gun Length oa N/A
Bore Length 389.0 in (9.880 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire 3 to 5 rounds per minute (?)


Type Bag
Projectile Types and Weights SAPC: 200 lbs. (90.7 kg)
HE: 200 lbs. (90.7 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge N/A
Muzzle Velocity 3,116 fps (950 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun 150 rounds


Range of 200 lbs. (90.7 kg) SAPC Shell with MV of 3,116 fps (950 mps)
Elevation Distance
45 degrees 29,860 yards (27,300 m)

Mount / Turret Data

Designation Twin Mounts:
  • Veinticinco de Mayo (3): N/A
Weight N/A
Elevation -7 / +45 degrees
Elevation Rate N/A
Train about +150 / -150 degrees
Train Rate N/A
Gun recoil N/A
Loading Angle -7 to +12 degrees


Data from:

  • "Naval Weapons of World War Two" by John Campbell
  • "Cruisers of World War Two" by M.J. Whitley