This is the large size serving or console bowl in the Oyster & Pearl pattern by Hocking Glass (now called Anchor Hocking). Vitrock is the Anchor Hocking brand name for white milk glass in this opaque color. Oyster & Pearl was produced in Vitrock from 1938-1940, which makes is authentic Depression Glass. The bowl is 10 3/4" wide and 3 7/8" tall. It is in excellent condition with no chips or cracks.