Quote Originally Posted by krinko View Post
"I would also add, that if the bolt is Australianicon, it may have been changed out in service...in other words, it is the right bolt."

No.
A replacement bolt fitted inside the D^D system would be, at the very least, lined out and renumbered to match the receiver. More likely, it would simply have a matching number but lack the assembly number that indicates an original bolt.
As an example: I found an "A" series Lithgow bolt and stuck it in my mismatched 1920, but as much as I would like to kid myself, it's not the right bolt.

As for what this '27 might be worth in the US---I just paid $400US for a nearly perfect Brazilianicon Contract M1908 Mauser----would I trade it for two mismatched 1927 Lithgows with bad bores?
The answer is not merely "NO" but "Fill-in-the-blank NO".
-----krinko
Ahh well. In that case, at best you have a mixmaster built on a rarer platform. The question comes down to the quality of the bore, it still might make a nice shooter.