Pyrex 1953 White Milk Glass Bowl Cereal or Soup - True Opal? Vintage AS IS

Vintage Pyrex bowl. Not marked with a product number, but dated 1953. White milk glass, plain (no design). Possibly the pattern called true opal, but I am not sure. Measures about 5 1/4" in diameter, 2 3/4" deep. Roughly cereal or soup bowl size. Has a long, shallow chip along the rim, extending approx. 1 1/2" long. Still displays well!