This large antique mold blown glass clip on bird Christmas ornament is from Germany. It's either a cockatoo or the smaller cockatiel, measuring a full 6 inches without the tail, which brings the total length from topknot to tail tip to just over 8 inches. Made of unsilvered clear glass, it's painted in opaque blue, pink, yellow, and white flat colors with black eyes. The molding of the glass is very detailed and realistic. It dates to the late Victorian or Turn of the Century era and has what I presume to be a spun glass tail. The fibers are a little stiffer than those found on later spun glass tails - these are almost like horsehair.
The painted finish has expected wear, especially at the beak where most of the paint is entirely gone. The old tin clip and coiled spring legs have some light rust. A small section of the spun glass tail has several loose fibers. Note the bird's eyes - the left is solid black, but the right has fortuitous wear creating a more realistic bird's eye. The large size, realistic appearance, and good condition make the bird an excellent addition to any antique ornament collection.