Unkown Pottery Bottle. Help!

Hi, I am wondering if anybody can tell me what this trademark is on this bottle. I got it at an estate sale and know nothing about it. I cant imagine it is a one of a kind or it would not have a mark on it. The bottle is about 10" tall and is made in pieces and put together. The bottle actually has a seam as shown and the top and bottom are molded on. Any information is appreciated....