Hi Acrop - Stavros Niarchos also owned the shipyard as well - he rebuilt it after it was bombed by the Allies in WW2. Clever resourceful man!

Yes Mike. Stavros Niarchos had Niarchos(London) Ltd in London and International Operations S.A. as well as International Maritime Agencies S.A. in Athens. Ceased operations in 2003 due to lack of interest for shipping by successors.

...this Greek company also had WORLD AGAMEMNON, WORLD ARES, WORLD ARETUS and the WORLD ARGONAUT in its fleet all sister ships I think...

Good (not so) old days. A ship built in Greece (Hellenic Shipyards, Skaramanga, Greece), by a Greek owner (Niarchos), flying the Greek flag and manned by Greek officers and crew.