HNoMS Frithjof was a 1. class gunboat (built for the Royal Norwegian Navy. Like the other Norwegian gunboats of her era, she carried a heavy armament on a diminutive hull. The vessel was built at the Naval Yard at Horten, and had yard number 76. Frithjof served with the Norwegian Navy as a gunboat and cadet training ship until stricken in 1928.
References
Naval history via Flix: Frithjof[link removed], Viking (First Class Gunboat, 1891-1920)[link removed], retrieved 17 March 2006