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Built as a cargo vessel under yard No 896 by Lithgows at Port Glasgow for the British Phosphate Commissioners (H. Gaze Mgrs.), London.
17 December 1937 launched as the TRIENZA.
Tonnage 6,333 gross, 3,502 net, 9,650 dwt, dim. 457.6 x 60 x 29.4ft. (draught), length bpp. 435ft.
Powered by a Burmeister and Wain 8-cyl. diesel engine 653 nhp., one shaft, speed 12 knots.
Passenger accommodation for 12 passengers.
February 1938 completed.

After delivery used in the phosphate trade from Nauru.
April 1964 sold to Hwa Aun Co. Ltd. Hong Kong, renamed in LEE AUN.
17 April 1967 grounded on the Palau Reef, south of Masinlok.
08 May 1967 refloated and sold to National Iron & Steel at Singapore for breaking up, she arrived in Singapore 27 August 1967.

Nauru SG 50 68 82 288, scott?
Nauru 1996 75c/$1.25 sg 448/49, Scott 432/3 and MS sgMS?, scott?
Nauru 2021 $5 sg?, Scott? More info on this issue is given on:viewtopic.php?p=21809#p21809
Sources: register of merchant Ships Completed in 1938. Enzyklopadie der Maritimen Philately (Navicula).

Nauru was finally set free from the Japanese on 13 September 1945, when Captain Solda, the commander of all the Japanese troops on Nauru, surrendered the island to the Royal Australian Navy and Army. This surrender was accepted by the brigadier J. R. Stevenson, who represented Lieutenant General Sturdee, the commander of the First Australian Army, on board the warship HMAS Diamantina. Arrangements were made to repatriate from Chuuk the 737 Nauruans who survived Japanese captivity there. They were returned to Nauru by the BPC ship Trienza in on 1 January 1946. In 1947, a trusteeship was established by the United Nations, and Australia, New Zealand, and the United Kingdom became the U.N. trustees of the island, with administration passing mostly to Australia.

Wikipedia.
Micronesia SG50.