In my Lehners pottery,clay and porcelian book of marks,your jug could be made by William Hunt co. Columbus Ohio. His company produced stoneware, and earthen ware marked with an H, rather wide and bold through 1966 to 1972 then a thinner H from 1972 to late 80ties. He does many workshops all over the Usa and Canada at colleges. Still may be in business. I have no idea what his items are valued at.