1960's iridescent porcelain square vase

1960's square rose bud and foliage vase, very unusual shape. one small chip of the glaze on the side of the vase( in last pic). 9 1/4" tall, 4"x 4" at widest point , top opening is 2"x2", and bottom is 3"x3". the bottom is covered with felt and the vase is in excellent vintage condition to be so old.