Hello Damien,
As per your request, attached pics of the V number on the 1913 Hooked Q bayonet. It also wears an early Lithgow scabbard, and the chape is marked to the 4th military district.
The 1919 bayonet is marked to the 3rd military district, but no chape markings. Early scabbard as well.
As I was digging these out of the gunsafe a few minutes ago, I found I had another early Lithgow bayonet, a 1918. Hate to admit getting old, but I completely forgot I had a third early Lithgow bayonet. It is a 1918 dated blade, and has no MD markings anywhere. Something else I noticed; none of these bayonets are drilled through for the oil hole on the pommel. Lastly, all three of these bayonets are wearing identical leather frogs. They are all stamped "John Boyle & Co" followed by a date. A quick internet search lists a John Boyle & Co leather works out of New York. Do you happen to know if Boyle made these on contract for Australia? Never really thought much about it until this evening.
I got all three of these in the late 1990's, from a collector who was liquidating his collection. The non-hooked bayonets were reasonably priced (around $100 each). I paid up for the Hooked-Q, forking over $400. Remember, this was 1998, and people told me I was a nit-wit for spending that much a bayonet!