ORP Kaszub is a corvette of the Polish Navy, in service since 1987, the sole ship of the Project 620 class. She was the first ocean-going warship built in Poland. As of 2012 she is in active service. The work on her design began in 1971, but the construction of the first ship started only in 1984, being laid down at Stocznia Północna (Northern Shipyard), Gdańsk on 9 June 1984. Kaszub was launched on 11 May 1986, but was found to have a warped hull and propeller shafts, which required repair. When the ship was commissioned on 15 March 1987, Kaszub was not fitted with much of the planned armament, with a 9K33 Osa (NATO codename SA-N-4 Gecko) surface-to-air missile launcher being omitted because of its unreliability on small, high speed ships, while the ship's main gun armament was absent bec