Blackening bottle

The bottle is incomplete: a small portion of the neck is missing. It is square-shaped, with slightly depressed and deformed walls, and a rounded shoulder; the neck is cylindrical and straight upwards, and has a straight, high lip with a flat top. The base has a wide, flat fulcrum, and the center is recessed and flat. The glass is an almost black green color. There is a vertical mold line on two of the opposite corners; this line crosses the shoulder and part of the neck, it goes to the base. There are traces of tinfoil on the neck and mouth; none other than the color of the glass and the shape of the bottle.