May I ask where you are located and how you came by this item ?? At top I can read Pottery cant tell if there is a word above that or not !! Then it says Potter ,,Bill Ow is what it looks like but there are no listed potters by that name !! I am just not sure if those are the correct letters !!
Its always possible that it is a studio piece and almost impossible to trace !! Studio/home potters are independents and may only be known within a small geographic area !!