This is an excellent example of an early real photo montage postcard published by the New Zealand based professional photographer David Aldersley. I have several of the small photographs on this card in my collection as full size postcards, including the two Panama Canal views which are also shown here on this Blog. The rough sea image can be seen full size in this Blog entry.
The back of the postcard is rubber stamped with David Aldersley’s “Ingleboro Photo Series” credit which I have catalogued as style “H”. My free guide to postcard backs is available as a digital PDF publication and can be downloaded here.