Mystery Opaque Dark Blue Glass Vase

I picked this up from a 5.00 table yesterday at a flea market and I haven't a clue who made it. My instinct said Imperial Glass of the mirror/luster finish and the rounded edge on the bottom but it lacks a finished pontil.

Details: 9" high, significant wear on bottom, mirror/luster finish

Regardless of what it is, I wanted a shape to fit in with the pieces above - so that part is satisfied but I would still like to know who made it. Group shot left to right: Imperial Lead Lustre, Mystery piece, Imperial Free Hand, Kralik Mica

A blank from Bohemia? A much later piece from China? Thoughts appreciated?