A postcard that feature Orange Base Hospital from Australia and here’s what I found about the place thru Wikipedia.

In 1822 Captain Percy Simpson drove into the Wellington District and established a convict settlement which was called “Blackman’s Swamp” after John Blackman. Percy had employed John Blackman as a guide because he had already accompanied an earlier explorer into that region.
In the late 1820s surveyor J. B. Richards worked on a survey of the Macquarie River below Bathurst and also of the road to Wellington. On a plan dated 1829, he indicated a village reserve, in the parish of Orange. Sir Thomas Mitchell named the parish Orange, as he had been an associate of the Prince of Orange in the Peninsular War, when both were aides-de-camp to the Duke of Wellington, whose title was bestowed on the valley westward, by Oxley.