British A.I.O.C. sea going screw steam tug Zerang stationed at Abadan, Persia in May 1946

Gross register tonnage 415 tons and as dimensions 128.0 (over all) x 32.4 (extreme beam) x 12.5 (maximum loaded draught) feet. Horsepower 1.000 ihp. Salvage and towing. Part of the fleet of Anglo-Irian Oil Company (A.I.O.C.).

Note
1. According to Lloyds Register 1947-1948 built by Scott&Sons, Bowling, Scotland in August 1938.

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) Link