I got this with some lamps and are not sure what it is, or even if it's got anything to do with lamps
Oiling bottle for a Lee-Enfield rifle, N°3Mk1 or N°3Mk1* . The later ones used on Mk4 & etc. were plastic mostly
You mean a No.1 Mk.3 or 3*. Earlier ones used them as well, but as it is found in Australia it is most likely from a No.1 Mk.3*.
If its brass and has marking on it, it might be worth looking into. I have an Enfield #1 mk3, and and an oil bottle like yours could be worth $20-$50 depending on manufacturer. A visit to the bay of evil might give you an idea of worth.