I sold the vase some years ago. I remember it well though. The opening into the body was fashioned neatly and I could stick my pinky finger through the opening. Also the green body tested positive for uranium. Shards of this particular blown molded pattern were dug at the Sandwich site by Mr. Barlow Personally back in the day, in various colors. The pattern is called "blunted diamond and prism". A bit of a misnomer I think. the diamonds are soft and and a bit rounded , but still a point.
The open bottom of the foot on some examples has always been suspect in my mind. Just not a thing in American glass in this period, unusual. Seems to be a thing in the sawtooth version. Twingedsphinx suggestion likely.
Christines vase I am not sure what to think. The Mellon ribbed body bespeaks Bohemia, But the heavy top rim treatment says not.