As German torpedo and gunboats became more heavily armed, the British Admiralty sought to develop its own torpedo boat equipped with a gunboat's armament. In 1942, Vosper developed an elongated version of their 70-foot boat featuring more powerful Packard engines, two additional torpedoes, and the capacity to mount additional armaments. The vessel was now 73 feet long. The Type 1 73-foot "Vosper" was followed by the Type 2, which was equipped with a 6-pounder gun. To compensate for the gun's weight, two torpedo tubes had to be removed. One of these boats was the MTB-523, which was ordered on December 2, 1943, and commissioned on July 5, 1945. It saw unremarkable service until 1949, when it was sold to Denmark.

The MTB-523 was introduced in Update 2.57 "Heavy Cavalry". Unlike the 70-ft boats the new MTB-523 is slightly larger and boasts a 6-pounder cannon, two Oerlikons and two torpedoes. Thanks to this, the boat can take on both similar small vessels and heavy subchasers. However, it is still made of wood, and its crew is small.