Old Green Pottery Vase Unique Design

I've never had a pottery that look like this one before,measure about 6" tall,strange looking piece,the design look almost like it was there applied. Appear to look like a map is the best way I can described vase,the bottom has 2 black letters might have been the place,maker,or store marks,appear dark like a sharpie,look like,"KA" but not sure,need help from anybody that can tell me something about this item,I've had this in my attic about 10 or more years,bought it at a Thrift store.

 

Hi, potties need to see bottoms, marked or not