Glass Message Board

I would say yes to your last question apart from “gold” which has left me a bit confused, although
 Sowerby did add gold decoration to some items, ie you may have a jet black vase decorated with chains and swag and the chains and swag would be paint in gold. I’ve not come across anything from Sowerby from this era completely in gold colour.

Thanks Jayne, I missed that one. I'll do some research.

I don't recognise and I can't find these 5" tall candlesticks anywhere. They are very Sowerby in their appearance and colour.

Great research, thank you

This dates to early 1880s I think  but the information in here is relevant to our discussion on this thread ref French and American similarities.
See page 400 for information on how someone from Boston allegedly bought glass samples of each item from Compagnie des Cristallerie de Baccarat and then, the report says, those samples were copied and the French sales to the States ceased thereafter:
https://www.google.co.uk/books/edition/Commercial_Relations_of_the_United_State/gIs8AQAAIAAJ?hl=en&gbpv=1&dq=davenport+glass&pg=PA415&printsec=frontcover

As I say, this dates to I think the early 1880s though and is referencing copying allegedly happening  4 or 5 years earlier so 1870s ish: see photo.
Unfortunately the report merely talks about Baccarat launching new coloured glass designs and that samples of each of those were bought. It doesn't describe exactly what the designs were, what the colours were, or whether they were opaline glass.  So not much help to us.