Vintage Blown Glass Paperweight - White Cloud, Black Shapes, Clear Bubbles

This really unusual vintage paperweight features three black shapes, almost like little tadpoles, floating over a white cloud. They are surrounded by bubbles and there are three coloured streaks in the middle of the ornament. 

The paperweight measures approx. 7.5 cm wide and 6.5 cm tall. 

Due to the vintage nature of this item, there are some tiny scratches on the surface of the paperweight, there is also one small chipped, which has been circled in the second photograph of the listing.