The Mogami-class (最上型?) were a class of four warships built initially for the Imperial Japanese Navy (IJN) as light cruisers in the early 1930s under the weight and armament restrictions of the London Naval Treaty. After Japan refused to comply any longer with that agreement, all four ships were rearmed with larger caliber main armament and were reclassified as heavy cruisers. (Wikipedia)
The top/port side pair represents Mogami and Mikuma, a vent forward of the bridge structure; abaft #3 turret is present. The remaining bottom/starboard pair as Suzuya and Kumano.
Note: the aircraft-cruiser conversion of Mogami is available in another set, bundled with 2x Tone and Oyodo.
http://en.wikipedia.org/wiki/Mogami-class_cruiser