Middleburn
That sheds some light on it, as to my mind the spider looks from a much earlier set of cranks, as those have a very large "offset".
On the rings though, I have also had problems with Middleburn rings having unequal spacings, between rings.
They appear to machine from differing thicknesses of Aluminium and cut the teeth at varying degrees of "off centre", with no particular standard. I feel they did this, to prevent folks using other manufacturers rings, so you had to buy a full matching set. I always found Middleburn cranks brilliant, but the rings very iffy at shifting and very poor on wear rates.