NOTE: Roger Radebaugh: …. designated Line 108 by Westmoreland and was shown in the 1950 price list under milk glass. Later made decorated, crystal decorated and turquoise carnival in the 1970's. It was a long running pair from the 1900's on into the 1980's.
Some of the older ones will have a simple number in the bottom of the mould. Later they marked these with the familiar WG mark. I would say your (Brenda B Joens) blue ones are in the 1910 range since the later blue milk is much different looking in color and not as pale.