I think im getting myself confused a bit here. I will start again,
I was looking at the interweb for details on 18th Century glass, as i bought a nice little
collection of early drinking glasses a few months ago, while googling about i was trying to
find a 19th Century book by Albert Hartshorne, I came across this link, http://books.google.co.uk/books?id=CxULGcNgd74C&dq=Old+Glass+-+European+and+American+By+N.+Hudson+Moore&printsec=frontcover&source=bl&ots=wJ6Voj_7oc&sig=XZvMUZGBRepz0uZ0iH4noh3CtEQ&hl=en&ei=wezuSpbBI97TjAfeubCZDQ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBMQ6AEwAA#v=onepage&q=&f=false
The book is, Old Glass - European and American By N. Hudson Moore
if you go to this link, it may take a few moments to open, there is an illustration of a Goblet (fig 47 on page 94)
by La Grana de San Ildefonso , Spanish 18th Century,glassworks opened in 1725 info on pages 96 onwards.
Could i ask my friends on the GMB, when they have a moment, if they could have a look at this link,
and if anyone has a copy of the book by N Hudson Moore.
I think , from this info, that i probably have a nice old rare piece of 18th Century Spanish Glass
The panels opinion on this piece would be very gratefully recieved,