I have a small matte green vase with an unusual design and unknown markings on the base. The vase measures 5.5 inches tall and 5.0 inches in diameter. The entire surface except the foot is glazed with a matte green finish; the foot appears to be covered with a clear glaze. The sides are grooved in an abstract design, some parts appear to take the shape of a tree and leaf but mostly it is unrecognizable (see pictures). The bottom has “215” incised, and a decorators mark with an upside-down circle J covering the the “5.”

Can anyone identify this?