It's rare for Australia since I think it's the only survivor. It's a 15cm sFH M93 - captured on the Western Front in 1918 - no information about when or where though.
The gun is in a small town - Nyah on the Murray River in Victoria. it's in fairly good condition exept for the lack of wheels.
The Musée de l'Armée in Paris seems to have one, at least I have seen an old picture of one on display. The collection at the Artillerieschule at Idar Oberstein also has one...