TC â€” These are notoriously difficult to attribute; almost impossible without the matching jug.
For charity shop selling purposes I think you could describe them as quality hand-made Stourbridge, where the term includes waifs and strays like Birmingham (Walsh, Smart) and London (WF).
I did speculate some time ago that counting ribs might help, but am now of the opinion that the same rib dip mould salesman covered all of Europe, and made sure that every glassworks had at least one of each rib count. If your rib count is a factor of 720 (an exact multiple of Â½Â°), it won't help. If it's not it won't help at present, but it will be more interesting â€” please always let me know, if possible with an ex-camera photograph + copyright waiver + name for acknowledgement. Rib counts get more useful when you get differences in one piece, like 18/16 Walsh Vesta Venetian
As for weight, the lightest tend
to be WF, with Walsh and the other quality larger glass houses a close second, but this doesn't always apply.
You shouldn't have too much trouble selling them in a charity shop, as they are a delight to use. I've got a 1+4 slightly iridescent green set in stock which I have a fairly high price on simply because we use them every now and again.