The Vintage Oval Split Casserole Dish is a charming piece with a blue and gray star pattern, made of white milk glass. This unique dish has two compartments, an oval shape, and a glossy finish. It is marked #4 and was produced in the United States using a fused glass technique. The brand ensures quality, and it is dishwasher and machine washable for easy care. This vintage casserole dish is a lovely addition to any kitchen collection.

Unsure if this is pyrex or Glasbake.  Only mark is #4 on the underside of a handle.  No chips or damage. No Lid. 

Let me know if you know more about this one. Not sure of the pattern name.  I thought it was nice.