Early Hong Kong mail as Navy Mail, Postcard from 1897

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German Reichspost 10 Pfennig postcard wit a black imprint  „Nur fuer Marine-Schiffsposten“ (Navy mail only). Cancellation: „ Kais. Deutsche Marine-Schiffspost No. 4 18/11“. (That was the SMA Irene).
Hong Kong to Wilhelmshaven, 16. Xi. 97. Fine condition.