Amazing Eames era pink and grey square planter vase

Very cool square shape vase / planter with number on the bottom, 1385. The name is filled with glaze and I can't read it. Heavy china (like Hall or Royal Copley). Pretty pink interior color and soft grey exterior. Square shape with downward turned edge. Pristine condition. Measures 3 3/8" tall and has a diameter of 4 1/4".