Mike's suggestion that Clevedon may still have copies of Margaret Thomas' booklet is quite true, and I can recommend this as a very good read for the small outlay of something like three or four quid - well worth getting, so thanks Mike.
Coming back to the problem of why so much material was previously attributed to the Nailsea factory (when in fact most so called Nailsea glass was never made at Nailsea) - it seems, according to Margaret Thomas, that the culprit was a wrong assumption made early in the C20 by the then curator of Taunton Museum. For copyright reasons I can't quote from Thomas' booklet, but the bottom line seems to be that this assumption lead to all the material in a leading collection of C19 glass, formed by one Mrs. Challicombe, being described as having all been made at Nailsea...........and like so many areas of antiquity, subsequent workers following suit without checking facts - for those who may have the booklet, it's page 26.
I've attached a pix of my 'cello' (this is the correct spelling
). Very pale blueish green (might it be described as aquamarine?? - certainly not the pale green of my hat shown above, somewhere) - c. 8.5" long, and appears to be an enclosed vessel. Pontil has been snapped from the foot, and quite a lot of wear on the back, so would seem this instrument has been laying down for most of its life. Attractive pincered work with some stones and bubbles as you'd expect. Plenty of dirt in the crevices, and in my opinion no later than c. 1850 - 1860 - possibly earlier. No idea of its origin though.
If inappropriate to post here, then please move - it might go into a 'frigger/friggar' post together with m's flask, perhaps