Just thought I'd throw another piece into the mix. It looks somewhat like the vase on the left of Sue's picture of three pieces. I bought my piece without seeing a photo of the base (I know, I know but it was $12.00). I think the piece looks fine until you get near the bottom, and then the base is very roughly finished (not unusual in some American studio glass btw) and has little wear. I thought Chinese originally, but then switched to Eastern European. I think Paul's suggestion Romania is worth following up.
BTW I don't SVdA for any of them is a likely possibility.
David