A Ross MK IIIB it has P14 type sights and markings that seem to indicate a connection Lithgo in Australiaicon. The marking are as follows.

On receiver Serial number 5483 under a capital letter A, a crown over crossed lances with a p under lances and the usual Ross M 10.

On barrel again crown lances and p, a crown 2C with an E under it, a large arrow head?, a large letter N and something very small I can't make out.

Stock has markings removed.