Ns
Flag
Company
Country
Nyki Shipping Netherlands
Empresa Naviera Sevilla S.A. (Enssa), Madrid
Spain
Norfolk & Southern SS Co United States
Niederelbe Schiffahrts GmbH & Co, K.G., Buxtehude
(different colors for letters)
Germany
NSC Schifffahrtsgesellschaft Germany
Nippon Salvage Co., Ltd.
Japan
Northern Shipping Co., Arkhangelsk
Russia
Nederlandsche Stoomboot Maatschappij, Rotterdam 
Netherlands
Nationale Stoomvaart Maatschappij, Rotterdam
Netherlands
Nederlandsche Stoomboot Maatschappij, Rotterdam (Dutch Steamship Co.)
Netherlands
N.V. Nederlandsche Stoomvaart Maatschappij "Oceaan", Amsterdam Netherlands
Nederlandsche Stoomboot Reederij Netherlands
Nederlandsche Stoomboot Reederij Akkermans NV, Rotterdam Netherlands
F & W Ritson (Nautilus S.S. Co., Ltd.), Sunderland.
UK
Northern Steam Ship Co. Ltd. New Zealand
Navigazione Toscana Italy
Karl Heinrich Danz Germany
Nassau Terminals United States
Nordström & Thulin A/B, Stockholm

(differents variants)
Sweden
N&T Argonaut Sweden
North Thames Gas Board, London

(different versions on color of letters)
UK
Nathaniel T. Palmer
United States