Hello Bryn,
A bulbvase it is not.
This vase could be listed as a "bulbous" vase because of the shape of the lower part. (I wish more people would do that instead of calling this type a bulb vase).
Often they are used as a "solifleur" because of the narrow neck (you could list it as such as well). A solifleur can be for one tall cut flower such as a lily or an amaryllis, with a bit of greenery added they can look quite spectacular. When you list it I would suggest it, it might be appealing.
As for the glass technique and how old it might be, it's back to Ivo.
Good luck with it.
Patricia