I inherited this bowl from an aunt, but the 'packers' just wrapped it loosely with two other old bowls, and it did not (unsurprisingly) survive . There are no marks on the base, it has greyish white glaze, over a white clay (visible on the broken edge)
Someone said it might be Portuguese, but I wondered if it was Spanish as I also inherited another bowl which was apparently Spanish but, I think, quite a lot older and more crudely made.