Thank you so much for looking for the attribution. I have a book on La Granja glass and will look in there when I return from my daughter's wedding in Italy. I had thought Bohemian and perhaps Moser, so La Granja would surprise me, the white beakers being quite thickly blown. Since I bought the white beakers I have seen a couple for sale on eBay and in an auction so doubt that they are Russian Imperial glasses; probably something later and less rare. Something for me to think on while I am away. Once more my thanks for your help to date. Neil