Re: Trying to identify year, make and model.
The Bush Ranger concept is certainly an interesting line to try and research seeing the revolver is in Australia. Also I believe there are 7 smaller notches on the other side of the hand grip, taking the tally to 12!!
As I said previously, I am now very keen to take much better photos than the ones I listed in my OP, but I spoke to my mate and he couldn't find any further identifying stamps or markings with the naked eye. I'll use a magnifying glass.
I'll have a much better look in a few days when I take the shots. But the information so far is intriguing to say the least!