Teapot: Yixing, chaozhou, other?

Hi all,
I have asked around about this teapot and no one I know is sure what to make of this. Some say it is antique Yixing (possibly for export), some have said it is Taiwanese or chaozhou but later said probably not, and other have said that it was definitely not Yixing but possibly Xiahuangbanna or Jinping Dai. No one has been able to read or recognise the seal yet.
Now I am far from knowledgeable here and have had to look up all the above. And I am still clueless about how old this is, where it is from.
Any two cents? Much appreciated!

And a picture of the inside

The writing looks Arabic. Might be Middle Eastern, Indian or Tibetan