HMS Perth was an armed boarding steamer of 2,505 grt that served in both world wars. Built in 1915 for the Dundee and Newcastle Steam Shipping Co, she was hired by the Royal Navy and fitted with three 4.7" guns. She served mainly on the East Indies Station in World War I and was returned to her civilian owners in August 1919. In 1940 she was again requisitioned and served as a convoy rescue ship until the end of the war. In 1945 she returned to civilian duties and in 1946 she was sold to the Falkland Islands Company and renamed Lafonia.
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HMS Perth Wikipedia(Text) CC BY-SA