Hi,
I've seen these glasses around before without coming by one myself. I think it might have been an apothecary piece but I'd like to hear from anybody who knows what it was actually used for.
The glass has an elongated funnel bowl measuring 5.8 cm (2.3 inches) in diameter at the rim. The bowl is thickened to the base and has a small pouring lip. It sits on a plain foot with a T shaped gadget mark (and yes, I've seen the dialogue as to whether this is a shear mark or not and am not convinced it is) which measures 5.5 cm (2.2 inches) in width. The glass itself is 12.5 cm (5 inches) in height.
Best wishes
Neil