This is a Bohemian Czech art glass vase, circa 1930.
The glass is black, with an iridescent coating that makes the colors on the outside shimmer in shades of green, purple and bronze.
The vase is 5" high and 5 ½" wide at the belly.
The shape is bulbous, with a short neck and a flared mouth. The rim has a very narrow edge. The pontil is round and slightly indented.
The glass is entirely black on the inside.
There are no chips, nicks or cracks. There is age wear on the bottom.