This class consists only of CHITOSE MARU, completed in 1921 as a 2,669-tons ice strengthened cargo ship for Nippon Yusen Kaisha K.K. The ship was requisitioned by the IJN as an auxiliary gunboat and served in the Northern waters, which was a relatively lower risk operational area when compared to the southern areas. The ship survived the war, was sold and converted to a salvage ship in 1957, and was not scrapped until 1962.
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