Dark opal glass but not opaque. This guy has cracks around the skirt with heavier concentrations to side and rear and a 1.25" slice type chip off the lower WG lip corner that created the cracks. There's also a small slice type shard off the UWG lip corner to the rear side. Priced way below book and for damage. Photo taken in direct sunlight and more photos of the rear and other damage areas available. $55 + shipping.