Lee-Enfield No.1 Mk.III
I own 3 of them, plus a No.4 Mk.I made made in the USA under lend lease. One of my No.1 Mk.IIIs saw service with the Aussie Light Horse in Palestine, circa 1917.
It's impossible to determine where this rifle was manufactured, but the wear and tear indicates that it was probably produced during or just after WWI. While it's possible that this rifle was made by the Lithgow Armoury in Australia, odds are that it is of Brit origin.
My regards,
Widewing