Spanish galleon flag around 1848

Source
J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations. London, 1848.

The Norwegian new merchant flag according to the Nederlandsche Staatscourant dated 4 June 1821

Christiana, 15 May. The Odelsthing accepted 4 May a new merchant flag. The flag was red coloured with a white cross and a blue cross within the white cross. She was to be used everywhere as soon as she was recognised by the Barbary States and especially there were none Turkish sea passports were needed.

Source
J.w. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags of all nations. London, 1848.

Flag and funnel of L. Smit & Co's Internationale Sleepdienst of Rotterdam, Netherlands

Source
Originally published in G.A.J. Bovens/G.J. Frans Naerebout. Op de Lange Deining. 

Funnel and flag of D. Lijnzaad N.V. Transport en Handelsmaatschappij of Rotterdam, Netherlands

Source G.A.J. Bovens/G.J. Frans Naerebout. Op de Lange Deining.

Funnel and flag of the N.V. Zuid-Hollandsche Scheepsvaart Maatschappij of Rotterdam, Netherlands

Source G.A.J. Bovens/G.J. Frans Naerebout. Op de Lange Deining.

Maritime flag of Cochin China around 1848

Source
J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations. London, 1848.

Merchant shipping flag of Bremen, Germany around 1848

Source
J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations. London, 1848.

Flag and funnel of the N.V. Stoomvaart Maatschappij "Rotterdam" of Rotterdam, Netherlands

Source G.A.J. Bovens/G.J. Frans Naerebout. Op de Lange Deining.

Portuguese pilot flag around 1848

Source
J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations. London, 1848.

Portuguese coaster flag around 1848

Source
J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations. London, 1848.

Portuguese merchant shipping flag around 1848

Source
J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations. London, 1848.

Russian flag of 1st vice admiral around 1848

Source
J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations. London, 1848.

Portuguese maritime war flag around 1848

Source
J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations. London, 1848.

Maritime flag of Pegu [Bago, Myanmar] around 1858

Source
J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations. London, 1848.

Maritime flag of the Spanish Philippines Company around 1848

Source
J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations. London, 1848.

Chinese maritime flags around 1848

Source
J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations. London, 1848.

Maltese maritime flags around 1848

Source
J.W. Norie/J.S. Hobbs. Three hundred and six illustrations of the maritime flags off all nations. London, 1848.

Flag and funnel of the N.V. Hollandsche Stoomboot Maatschappij of Amsterdam, Netherlands

Originally published in G.A.J. Bovens/G.J. Frans Naerebout. Op de Lange Deining.

German swastika flag official trade flag according to the Dutch newspaper Het Vaderland dated 17 September 1935

An item reported that Essberger head of the German sea shipping sent radio telegraphic orders that on board of all merchant ships the German swastika flag was to be hoisted as official trade flag.(1)

Note

1. This must be John Theodor Essberger C1886-1959), Führer der deutschen Seeschiffahrt, and tanker ship owner at Hamburg. Germany who also had served in the German Imperial navy until 1924.

British red and blue flags not longer allowed to be hoisted except for some exceptions according to the Dutch newspaper Nieuwe Tilburgsche Courant dated 20 September 1939

An item dated London 19 September referred to an announcement of the department of publicity. During the duration of hostilities was it not allowed for merchant and other private ships to hoist the red and blue flags. However Dominion ships, stationed training ships and vessels of public services were excluded from this prohibition. The blue flag belonged to the reserve, the red one to the merchant marine.