I would not say these were made by any of the better known makers. I usually see them with "Venetain Glass" labels. They are usually Red or Green, in an oval shape, not any known makers label like Barbini, Toso, etc. I recently had 1 with the "Vetro Artistico Veneziano" label. Theres a thread on this board about that same label.
The only one that could be Seguso would be #1, because of the use of Red and Gold, but the shape is very similar to the "Venetian label" pieces, so it might not be. There really isnt that much researched about those pieces.
Hope this helps you out.