Nadi vase maker unknown

I see quite a bit of ware in this style and have a feeling it is NZ... but this is the first one I have seen with any sort of mark. It looks like felt tip so of course it could have been put on afterwards - by the owner perhaps?  The green vase has the mark, the other is unmarked (and has a foot ring of sorts). I THINK these two came from the same maker but I am not even certain of that. Whatever - this very shiny, quite well made slipcast ware deserves further investigation - so here tis. Green vase 19 cm, brown vase 15 cm high.

I see two different types of clay and two different finishes to the base on those pieces. This makes me wonder if they are made by the same pottery.
Hopefully someone has some info on the name Nadi?