It's the "Unknown Romanian Maker". I do think these have some age, they appear from all over the world, folk do pick them up thinking; "hmmm, interesting? I wonder what it is." I heard of somebody with about 30 odd bits, I've had 4 (gave one away, regret it).
The identifying features these pieces contain are:-
*Biggish air bubbles, with black gritty inclusions. Often featured more heavily towards the base.
(Often confused wrongly with Schott-Zweisel)
*Coloured enamels in the walls of the vessels with a highly characterisitc feature... there is a tiny air bubble in a halo of denser enamel, which fades as it gets to the edge of the halo - it's the way the enamels are used in bits of Nazeing and Grey-Stan.
*A bright, rainbowy iridesence on the surface of the piece.
*Ground,but not polished, flat bases.
*Thick, heavy glass, often with pulls in, or other small features applied to, the surface of the vessel.