This is a classic jar by Lorraine Williams.  It is a long neck and a low shoulder with a sharp edge.  The neck of the jar is square at the rim  The surface of the piece is incised with rug designs that encompass the entire piece in vertical bands.  They alternate with red and black bands.  Note the smaller sections just above and below the shoulder that are black and red.  The background area is the natural color of the clay after the firing.  It is a striking and complicated pattern.  The jar has been traditionally fired to create the surface coloration.   After the piece is fired it is covered in pine pitch, which is typical of all traditional Navajo pottery harkening back to when it was utilitarian.  The jar is signed on the bottom in the clay, “LW”.  Lorraine has won numerous awards for her pottery and been featured in books such as “A Legacy of Generations”.