http://www.cajunc.com/art-american-pottery
Update !! Ran into info on his vase while researching another item !! Turns out the bottom that I thought was an over run is a technique used by American Bisque Pottery !! Will attach a link later !!
Link attached read down to the part about the foot and you will find that this is called a wedge foot !! I had not heard of a wedge foot before so we both learned something !! http://news-antique.com/?id=781341 This link has company info !!
http://www.criffer.org/searchcat.php?q=foam+edge&cat=870&page=1
Not sure who made yours but Hull used the foam edge as well as others !! Most are inexpensive and often only have USA on the bottom !! The bottom was supposed to be unglazed and some how the vase color ran underneath !! Factory error !!
Thanks so much for this.