On the butt stock is 2 MD ~ The 2nd Military District was an administrative district of the
Australian Army that covered most of New South Wales, with its headquarters in Sydney. The southern border with the 3rd Military District was the Murrumbidgee River rather than the Murray River, and the western part of the state around Broken Hill was part of the 4th Military District.
Should have the same stamped on top of the reinforce as per pic of my 1916.
One thing that no one here or the other experts in the field can explain
Skennerton or Labuda is the circle with the question mark I surmise it may have been an inspector and his inspectors number appears above it.
I heard via another source that this may have been from and inspector sent out from
England as apparently they did send out a few to ensure that the rifles were being made to the accepted standard so I cannot rule that out.
It could be correct as there are a couple here in Aus that own similar marked No 1 Mk III's.
Nice looking rifle good catch my friend has a 1915 Lithgow and cleans up with it.