Having seen numerous No1 Mk5's, sorry to say but it looks like a complete refurb,
Butt looks like a savage no4, and there is no marking disk! Bolt head has Australian markings, and the top hand guards should have rivets either side ot the centre band. Nose cap and bolt have also been renumbered at some point.
All that said, still a rare rifle so a nice find!
I agree with the above. The bolt head is clearly stamped "MA".