ok that peculiar type of cutting around the rim of the OPs red goblet.
That is not easy to find.
I recognise it because of my little blue lamp/perfume bottle which I think dates quite early 1800s.
The similar cut pieces I've managed to find are also dated to the 1830s ish. So apparently quite a bit earlier than the silvered glass goblets from Varnish & Co, which are also cut.
Seemingly most of those pieces come from Buquoy (I
think)
See this cabinet of red Hyalith glass in the Passau for a couple of examples with intricately cut rims:
https://lh3.googleusercontent.com/-MsOYTBXCHhY/TXnP76Z-oXI/AAAAAAAAB-8/RNE14sI6Lzs/s1600/100_7486.jpgHere is an example I linked to earlier but in a format which can be enlarged greatly. It's a red hyalith perfume bottle:
https://www.the-saleroom.com/en-us/auction-catalogues/dr-fischer/catalogue-id-srdrf10002/lot-d99aa27b-6dcc-46fb-ac7f-a3fc016e1403Notably on the pair of amethyst vases I linked to earlier, one has the cut rim, the other doesn't:
https://www.bidsquare.com/online-auctions/stair-galleries/pair-of-varnish-co-amethyst-mercury-glass-vases-and-an-alethoms-sons-patent-green-mercury-glass-stemmed-compote-1026957According to Farbenglas II Waltraud Neuwirth, pp126 and 127, both Buquoy and Harrach produced Amethyst coloured glass - on the pieces shown in the book Buquoy's referred to as Amethyst and cased '(inside violet, outside colourless)', and Harrach's uncased and referred to as violet glass.
The other thing is, the silvered glass goblets, because they are chunky in shape, remind me of the Buquoy Agatinopal glas goblets , which are also chunky and oddly shaped.
Buquoy was supplying Egermann to make the Lithyalin pieces as far as I know, which were made using silver mixes.
Question to self - why
were the Agatinopal glas goblets so chunky? They are odd. I love them but they are definitely I would think 'decorative' rather than to be used.
According to the information in this book - A Dictionary, ... John Ramsay McCullough
In 1837 Buquoy had five glass houses and Harrach one (SEE PAGE 231), so at least in 1837 it seems they were capable of providing glass to be silvered? Whether they did or not, and also whether they were still capable, size and business wise, of doing so in 1847-1851 who knows at the moment? But it's a possible avenue to explore :
https://books.google.co.uk/books?id=vfERAAAAYAAJ&pg=PA231&dq=buquoy+glass+exports+1847&hl=en&sa=X&ved=0ahUKEwj0ldXqucbjAhWimFwKHR4cBjwQ6AEILjAB#v=onepage&q=buquoy%20glass%20exports%201847&f=falseI'm off to try and examine pics of the agatinopal glas pieces to see if they appear to be hollow in any way.