The are correct about this being a heavy machine. All the information we have found for a Richards 10 foot borer suggests they weighed about 33 tonnes. This machine weighs 53 tonnes. Without incriminating myself too much, its a good thing the truck made it through without being pulled in by the weight checking authorities. The overweight was unintentional and only verified when the crane operator unloading it at our site showed me his scales readouts. Most of the mass is in the base which is basically the same diameter as the chuck as opposed to all other illustrations I have seen where the base is much smaller than the chuck.
The other hint we have is that it has a small tag on the main motor from the Australian Department of Supply. This department only existed under that name for WW2. However, all this really proves is that it was registered for use under wartime manufacturing regulations, not that it was purchased just then. Cheers