Vintage Hazel-Atlas Moderntone Platonite cobalt blue creamer pitcher.
It is made of white opaque milk glass that has been flash-coated with a cobalt blue color on the outside.
The pitcher features a ribbed design and was produced by the Hazel-Atlas Glass Company, likely in the 1940s or 1950s.
The "Platonite" process was patented by Hazel-Atlas in 1936.
It is a popular item among collectors of Depression-era glass.