It now belongs to blues-roots and country artist, Johnny Green, and is on loan to me. I have gone through the guitar and figured out how it works. It appears to be 1940s vintage, but I doubt a guitar this sophisticated could be from the Australian guitar maker of the same name. The guitar is the product of a complex design process, and required a factory versed in bakelite, plastic molding, aluminum stamping, machining, electronics, carpentry and high quality finish work.
There are three semitone settings on two pairs of strings indicating simple triad tunings like A Major. In the flat position, the adjustable strings are tuned first, and then by semitones higher, arriving at A, C#, E. THe strings are suspended below the roller bridge and nut.
One more adjustable string, or independents would have made all the difference. I have it in A6th, which gives me changes to a 4 string C#m, and a 5 string E9th. The bottom string pitches being debateable.
The tuning shifter works well, and the pick up has full rich tone, if not particularly loud. Of course that could be remedied.
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If you want to have an ongoing discussion, please email me, don't use the Forum messaging which I detest! 
