Mid 20th century in age. Sorry, no value in plain clear 20th century glass like this.
WT stands for Whitall Tatum.
Chris is correct, there is little monetary value for your glass. I will caveat with, * now *. All our most prized glass was once so common, it too was worthless trash! Hold on to it, in the future, the answer may change. In the interim, you have a cool piece!