s.s. 'Primo' - The vessel was steamer of 1,037 gross register tons owned by the Shipping Controller but managed by J. J. Thomas & Company Limited at Cardiff. She was defensibly armed and en route from Penarth to Rouen with a cargo of coal when she was torpedoed and sunk by UB117 off the Godrevy Light, St. Ives, Cornwall on the 18th September 1918. The crew survived. The vessel was built at the yard of J. Meyer's Shipbuilding Company of Zaltbommel in the Netherlands.

This vessel should not be confused with a vessel of the same name which was of 1,366 gross register tons and which was lost during September 1914.