Hi Paul, sorry I have not been able to get back to you until now. Thanks for looking all the same and for your most recent info. I'm not sure what you meant by vitro-porcelain, so decided to look this up. I found information, that it was first introduced in the USA in the 1930's. Then I found that Sowerby produced Vitro-Porcelain in 1877. I'm confused

. In other words, I'm trying to find out if my piece can also be referred to as Vitro-porcelain.
This site below, that you are probably familiar with has some interesting information, as I was unaware that some moulds were sold to other companies, which of course, if this occurred with my piece, yes it would be difficult to date.
http://www.pressedintime.com/sowerby.htmWith reference to your second and third picture, are these glass and if so, is my piece an ornamental or is it a 'desert service?'.
During further investigation I came across this site:
http://www.ebay.co.uk/itm/ANTIQUE-SET-5-HENRY-GREENER-SOWERBY-OPAL-MILK-GLASS-PLATES-1876-/300876710926?pt=UK_Art_Glass&hash=item460da6440e#ht_4318wt_1200The information within the description refer to Henry Greener working for Sowerby and then pulling out to work on his own. Is this correct? As previously mentioned, I'm not knowledgeable on the subject matter in question, so please forgive me if I have not been clear on anything mentioned. It's just that I have become very interested in the plaque/plate and would very much like to find out as much as I can about it, even if a date cannot be ascertained. I wonder why the pictures have also been removed.
