57 55 J or 57 mm, 55 caliber length model Jokinen coastal gun was a Finnish light coastal gun designed during Continuation War. This was the first coastal gun designed and manufactured completely in Finland and it was intended to replace the older 57 mm Nordenfelt and Hotchkiss guns, but the design was found faulty and only 11 pieces were constructed. They were used for training after World War II until retired in the mid–1960s.