Model the GLASS geometry using the lathe tool
Now we need to group the created circles inside a Loft (Create> Generators>loft) to shape the geometry of the glass. We can adjust the number of glass faces by adding subdivision to the mesh of the Loft. Adjust Mesh subdivisions in U to around 57 and Mesh subdivisions in V to a value close to 32.
Adding some extra subdivision will help the geometry of the glass look more realistic later on when we apply the glass material to it.