[Lugers down under]

Thanks guys,
I thought it had to be something like you both suggest.
If you look closely at the second photo, you might notice a small chip in the second part of the toggle link, where it joins the third section.
I think that the gun has has a "woop'sy" at some time and the original knurled toggle section has been broken and thus replaced.
I think the gun may have been refinished at that time as there is little to no wear marks on the cams and the area under the safety lever is blued.
All of the other parts of the gun are original and numbered accordingly.

I think I may have got me a lemon., still it is an interesting item all the same.