Tried to find your pattern but they made so much of this stuff that it would take forever !! Some patterns were named and some just numbered !! e Pretty sure yours is 1930`s or 40`s although similar patterns were used by others later than that !! Yes they made many things in Crystal !! Just hold yours by the foot and tap with a fingernail,,, crystal has a musical bell like ring !! Glass has a dull thud !!

attached

http://www.cutglass.org/articles/art26libbey.htm

A little history of Libby Glass that may be of interest !! Can you post a pic of the Libby signature ?? Yours look like a 1940`s pattern !!