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<p>Mr Walter Duffield- Pastoralist and Politician 1816-1882, Treasurer of South Australia  1865 to 1867. Photographed c.1885. Text below photograph reads: 'Johnstone O'Shannessy&amp; Co/ Next post office Melbourne'. 
He started business in Gawler as a flour miller  and merchant in September 1847, and, in conjunction with Harrold Brothers as Duffield owned Weinteriga and Outalpa stations.
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<bdi><a href="https://en.wikipedia.org/wiki/en:Johnstone,_O%27Shannessy_and_Co" class="extiw" title="w:en:Johnstone, O'Shannessy and Co"><span title="Photographic studio in Melbourne, Australia. (1865-1905)">Johnstone, O'Shannessy and Co</span></a>
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The History Trust of South Australian,  South Australian Government <br> Photo <a rel="nofollow" class="external autonumber" href="http://data.history.sa.gov.au/sagpc/media/preview/728?maxsize=1000">[1]</a> <br> Object record <a rel="nofollow" class="external autonumber" href="http://data.history.sa.gov.au/sagpc/getitem/728">[2]</a>