Well it looks like this is the set of gold plated Aussie made Imperials. In order TD , 797, 727, 827 and 835.....and it's taken some time to put together. As such these probably represent the highest end Aust. made Imperials as the sterling silver ones are only marked on the nib so I suspect the caps and barrels imported ( still that's not a certainty). I haven't seen an Aust. 777 ( but they're either rolled gold or gold filled) so can't be sure if it exists or not. All bar the TD are either mint or near mint with the 797 being easiest to find and the TD the hardest to find in Aust. form from my experience.
the nibs..
and all caps fully marked, note the early TD has Australia while the c/cs have Aust
Regards
Hugh
