<a href="https://en.wikipedia.org/wiki/HMAS_Castlemaine" class="extiw" title="en:HMAS Castlemaine">HMAS Castlemaine</a> Bathurst-class corvette, berthed at Gem Pier, Wiliamstown, Victoria, Australia. The <a href="https://en.wikipedia.org/wiki/QF_4_inch_Mk_XIX_naval_gun" class="extiw" title="en:QF 4 inch Mk XIX naval gun">QF 4 inch Mk XIX main gun</a>.
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