British A.I.O.C. inland screw steam tug Thegon stationed at Abadan, Persia in May 1946

Gross register tonnage 174 tons, horsepower 500 ihp and as dimensions 116.0 (over all) x 23.0 (extreme beam) x 8.8 (maximum loaded draught) feet. Part of the fleet of Anglo-Irian Oil Company (A.I.O.C.).

Source
Quatar Digital Library's digital archive. Naval Intelligence Diversion Admiralty, S.W. 1, Persia Intelligence report May 1946-C.B, 1885 (X) (5/46) Website