This is a vintage French's mustard clear glass jar with a screw on lid.  The jar is a beehive ribbed looking jar with a flat panel in the front.  The jar is in very nice condition with no chips or cracks and is clear with no cloudiness.  The lid is also in good shape.  The jar is 3-1/2" high and 2-1/2" in diameter.  The bottom is marked with a Hazel Atlas mark and Design Patented, 510S and 8.