This is a MacBeth-Evans Monax white milk glass Petalware pattern 10 3/4" wide salver plate or platter. It is in excellent condition with no chips or cracks. MacBeth-Evans produced Petalware in Monax from 1930-1950. Petalware pieces were made with plain bases and with rings bases. This is the rings bases variety.
MacBeth Evans Monax Petalware White Plate Platter