I was thinking S&W too, but this really top end old stuff isn't really my area!
Can you make out if the daisies are in any way typical of any particular engraver, jp?
Alacarts, we really do need to see some good clear close-up images, from all angles.
We need to know how many sections the glass was made with, details of the stem etc.
But be careful with them - really careful!