old dark green hand blown flask/bottle.I have no idea about this bottle. It is about 6 1/4" tall, about 4" wide one side and 2 3/4" wide the other way.Has about a 1" wide ponytail in the bottom,,,off center and about 1/2" deep. Looks like it was flattened out on the top when it was still hot, kind of a smushed down lip. It is FULL of bubbles and debits. No cracks or chips. It is not diametrical in any sense,,leans a bit,,top is kind of egg shaped. Came from a estate sale of a guy in his 90's. I would call this a very dark olive green..pretty sure it is not called black glass. Pretty unique bottle. One of a kind for sure. JIM