Art Glass Vase-Help with ID, Please

Anybody know the maker of this unusual art glass vase? Lots of bubbles, copper-color inclusions, swirling colors. Height is just over 12". Ground bottom and pontil. Well-established wear on the underside. Thanks in advance.

 

If you look through the base from the side, is the glass clear or colored? If clear, that means the color is applied to the interior and not in the glass. In the absence of other identifying marks, to me, that's a make or break difference.

 

Stuff? Could it be that once the artist got it looking like he/she wanted, they cased over it with crystal?

 

makes me think of Northwood Etruscan https://www.google.com/search?q=nor...ved=0ahUKEwip4Nzp4OLNAhWEKWMKHT2LAGEQ_AUIBygC

 

The glass has a yellow color and the work is internal not on the surface. Thanks for all your ideas. Northwood "Etruscan" is new to me and there are indeed similarities but also too many differences.