firstly it is total garbage and you need to send it to me.
it is a 1915 Lithgow (
Australia
) manufactured Sht LE (SMLE) no1 mk3, that has been sporterised.
the 3MD marking shows it was issued in/to? the 3rd military district, the state of Victoria.
the milled sight protector is era correct, the trigger has the star-A stamp indicating an early Lithgow made part. it should be on most of the original parts.
edit. is it still chambered in .303?
this should probably be in the lee enfield forum, hopefully one of the moderators will move it.