Mystery mark on a black and white pot

Hello there,

I've been unable to track down the maker of this pot, received 35 or so years ago as a gift.  I'd love it if someone could help me identify the maker's mark and/or style.  The mark could be a-t or c-t (or t-b if inverted?) or similar but I can't see it either in the Marks of NZ Potters book or your online directory.

As far as we know it was bought in Cambridge so I'd imagine it's a North Island potter?

If anyone knew anything about the type of glazing, that would also be really nice to know.

Thanks so much!

Hi there, this lovely pot has been Pit Fired, which gives nice effects.
The first photo of the mark is the correct way, but I'm not sure who it belongs to.
Hopefully somebody will recognise the potter.