Vintage rare McKee Glass Chalaine Blue Double Egg Cup 1930's 4.25"

Rare hard to find very old / vintage McKee glass .. i believe this is called Chalaine Blue SlllDouble Egg Cup circa 1930's Rare 4.25" tall 2.8” diameter on the bigger side end and almost 2” diameter on small end. 4 1/4" tall. The swirl dark colors unevenness lines are typical to this glassware .. not danaged! No chips no cracks I can’t believe this is 1930s!