---Type 6623/Type 24 missile boat
In 1960, the Soviet provided China with the blueprints and parts of Pr.183R Komar Class missile boat. However, cooperation ended soon due to the China-Soviet relationship becoming worse. In 1962, with the already-delivered material, China built 2 ships without Soviet technicians' help, designated them as Type 6623. It never go into mass production since it fail to meet PLAN's demands.
Type 24 (or Type 024) is a improved version designed in 1964, NATO called "Houku Class"(or Hoku). The wooden hull of Type 6623 was replaced by a steel one. Bridge was completely redesigned. The mast is foldable so it could hind into tunnel hanger. Main armament including 2x SY-1 anti-ship missiles and 1x Type 61 twin 25mm AA gun.