Thanks John.
Paul, the Scottish Glass link shows a bowl with undulating loosely crimped rim that grades fuchsia pink at top to amber at bottom.
I don't even with careful squinting, see any violet or blue which I do see in all the Webb Alexandrite pieces that come up on google search if you put Webb Alexandrite glass in google search and then click on images. That bowl stands out as being completely different.
I also don't necessarily associate that shape with Thomas Webb. I know though it's a kind of catch all 'Victorian' shape and that pincering and crimping rims was in vogue then, so it's not specifically the shape that put me off.
On ebay however I also see a pair of bowls the same shape as that one on Scottish Glass, also with pink to amber grading, and described as New England Glass Company Amberina.
I don't know for sure that the ebay seller has the correct identification either but if they were Libbey I think they would be marked.
I think SOME New England Glass Company amberina was marked. The seller doesn't mention a mark so I'm assuming they are unmarked.
I'm asking because I'm researching a bowl I have in this colourway. It's not this shape. It does have a shape I might associate with Thomas Webb but haven't been able to. I have however been able to associate it partly with Stevens and Williams so therefore I thought it could well be a Thomas Webb shape as well.
I think Mount Washington and then Pairpoint also made 'Amberina' glass however I can't see any that appears in this fuschia pink to amber so I've discounted them just for the moment.
Date wise I'm sure I read on here that the patent for Locke's New England Glass Company Amberina and Thomas Webb Alexandrite was only days apart, with possibly Webb getting there first. 1886 if I recall correctly?
I remember reading it because I wondered about and had searched for a link between Joseph Locke and Thomas Webb Glass. (meaning I wondered if Locke had first alerted Webb to the reheating process and gold recipe and then moved to the States and took the process with him to New England Glass company where they launched Amberina (invented by Locke apparently. This is what I read, not that I have definitive proof of that).) So far I've not found a link though.