Actually, the vase does have inclusions throughout, which look like sand grains. In the picture below, you can see some of the larger grains (hopefully) in the large bubble. I don't have a macro lens to properly photograph the smaller grains, which as I've stated are throughout, although not in as great a concentration as in the blue piece.
I own a few pulegoso pieces, and that technique doesn't appear to involve inclusions at all. Information I've obtained on the net points to the efeso technique being used by Barovier circa 1964. (This piece has, to my eye, a mid-sixties look.) The execution is also of very high quality, not cheap tourist or mass-produced glass. However, I've found no pictures showing Barovier efeso in colors other than blue, gray and clear. This one is actually a rose color, quite lovely. If not Barovier, did other better Muranese producers work in this technique?