Hi Bob.
That really is a wonderful discovery & to think all these years has only been just up the road from here awaiting your arrival. It all fits now.
Slightly, well quite a bit OT actually.

It must be something in the air around here I think.
For many years near that location there were a pair (maybe there were 4) of 6' cast steel wheels, thought to be from the days of the Bullock Waggons & used for carting the big Stringybark tree trunks.
The disappeared within the last 4 years I reckon.
Also, not 1/2 (or should that be .5

) kilometres away, a 1912 Hornsby 12 HP Hot Bulb Stationary Engine was unearthed & recovered from a pile of Blackberry bushes & restored back to near original by me.
This had the Flyball Governor & a 5' cast flywheel.
I have recovered a 6" piston water pump (10' long) that was going to be pushed into a hole & it makes one wonder what else may have been lost forever from around here.
A 1/2 dozen WW2 Scout Cars spring to mind here. Wonder where they went?