This is a Pyrex 1957 F.T. 92 that has DI.W.S. Embossing with a very large star on it. I just recieved this insulator from Sicily and it is in excellent condition. The insulator is a CD 444 but the DI.W.S. embossing with the very large star is not listed in GIFONIA guide. Hopefully the picture shows clearly the size of the embossing.