Help needed for Lithgow rifle ID

[smash1911]

I will try and post up a picture when i get home at the end of the week (damn working away from home on a mine )
It still has the front sight. Everything on the rifle looks original, the number stamped on the stock corresponds with the number stamped on the receiver.
It just seems funny that it doesnt have the rear sight (volley sight?) that every other .303 i have seen has.
Another thing i forgot to mention is that on the stock, and on top of the reciever there is a stamp that looks like this

\|/
S
/|\

I dont know if that means anything significant??

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[No4Mk1(T)]

Another thing i forgot to mention is that on the stock, and on top of the reciever there is a stamp that looks like this

\|/
S
/|\

Sold out of service marking applied to arms released for sale to the public.