AWM caption : <a href="https://en.wikipedia.org/wiki/Rottnest_Island" class="extiw" title="en:Rottnest Island">ROTTNEST ISLAND</a>, WESTERN AUSTRALIA, 1973-08-25. NO 1 COASTAL DEFENCE GUN, <a href="https://en.wikipedia.org/wiki/BL_9.2_inch_gun_Mk_IX%E2%80%93X" class="extiw" title="en:BL 9.2 inch gun Mk IX–X">9.2" BREECH LOADING</a>, OLIVER'S BATTERY. PART OF THE FREMANTLE COASTAL DEFENCES INSTALLED 1936 TO 1939.
not stated
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