Royal Netherlands Navy WWII High ColoursOriginal vintage World War Two propaganda poster They keep our colours high! What are you doing? Zij Houden Onze Kleuren Hoog! Wat doet gij? featuring an illustration by Jan Verhoeven (Johannes Cornelis Verhoeven; 1917 1997) depicting a view from the deck of a ship with a flag of the Netherlands flying over the blue sky, a cruise liner ship, military warship and naval steamship sailing on the sea with a plane overhead, a crown topped anchor emblem of