Could well be cut glass, I'm sure you a right

I have difficulty distinguishing one from the other especially when mould seams are cleverly hidden in the pattern and are well finished. Yes I meant stopper. It only has a short "drop rod", which is just the length of the neck. The whole piece stands 6.5" high (can't figure out how to get a fraction on my keyboard

I haven't got a copy of the book you mention and daren't buy one as it might lead to a whole new collection, although I guess my twelve perfume bottles constitutes a collection

but they are mostly more recent hand blown ones.