Probably at opening of Gladstone Dock 11 July 1913
Copyright unknown (no stamp)

Photograph of Princes Landing Stage Showing Royal Parade | National Museums Liverpool

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https://www.liverpoolmuseums.org.uk/artifact/photograph-of-princes-landing-stage-showing-royal-parade

Photograph of Princes Landing Stage Showing Royal Parade

http://content.liverpoolmuseums.org.uk/artifact/photograph-of-princes-landing-stage-showing-royal-parade