US postal service 1900, steamer empress AUGUSTE VICTORIA, coloured Litho picture postcard "aboard. " with 2 C and sea mail duplex 23.5.00 and number "7" to Aschaffenburg, despite sufficient franking not recognized, although reciprocal mail exchange took place, with Tax single circle postmark "SPA / T 7" on face postage due and with blue pencil "25" Pfg marked, besides with for sea mail very rare violet single circle postmark "postage control . " and handwritten "25", arrival 2.6.00 on face, superb