Bought this one out of curiosity: pressed glass (I think), the base is ground and highly polished. Diameter is 18.5 cm, height 9 cm.
The slightly iridescent champagne colour is definately applied to the outside -- the glass is colourless when looking through the base, and quite obvious at areas where the colour has flaked off; I am still unsure how the "glue chip" surface was made -- even at areas where the colour has flaked off there is still the surface structure left, so it should be the glass itself and not another layer of coating (but I cannot guaranty that).
I guess it was produced this way to mimic better French acid treated glass from the 1920s/30s. But by whom and when?
Thanks,
Michael