It's purely hand blown, not mold blown. The quality is very good to excellent, with relatively thick glass, like Blenko (not tinny). Also has a pontil mark on bottom. The yellow is vibrant, almost electric. It looks like, but isn't, vaseline glass (I black light tested it). Another interesting thing maybe not noticeable in pictures is that the color is semi-opaque. I've seen this foil label on a couple of other heavier pieces; I have or had an unremarkable piece in smoke glass with this label.