Hi Ardy,
I would be interested in seeing a good pic of the underside of the bottle. It looks a little odd in the last pic, but it could just be the angle. The bottom for a Seguso would typically be a flat polished finish, as that is where the label was typically applied. We have 3 Seguso's and they are all that way, as are the images I have seen of known examples. The shape is similar to known Seguso, especially with the almost trademark "collar" below the stopper. The exception to that is that my experience is that the Seguso collars are more rounded on the top, and this one appears a little flat, and not quite as well finished. The Seguso stoppers I am familiar with are also more angled on the sides of the ground regions, and this is quite straight ( close to parallel sides).
The green one is 4.25 inches tall and the Burgundy and amber one is just over 4.5" tall.
I do not know who did this one, but IMHO it is not a Seguso piece, although it is similar.
I am attaching a couple of images of Seguso pieces and labels that are in our perfume collection (Actually Peggy's collection which I keep enlarging for her). Both have the same label on them.
Hope this helps.
Craig