Well, I'm certainly not in a position to add anything useful to chemical dating methods, but perhaps I add something that at least gives an indication of age in some of the designs.
I own two Vladislav Urban Moravia vases, triangular shape. Got a blue one first. When I got my second one in, an Amber version, I noticed it was much older than the first one, from the clarity of the detail in the surface structure. In the blue one, the general shape of the Moravia is still present, and the surface structure of the larger protruding bits is exactly the same, but much of the underlying detail is gone, suggesting it was produced a lot later than the Amber one, when the mold had already lost its details.
My deduction of course can be thrown out of the window if it turns out that the loss of detail can also be attributed to a different viscosity of the glass used, in which case the blue glass mixture could have been too thick to settle in the smaller crevices of the mold. I really don't know enough about glass production to say which of the two is the more likely option.