Retro hand blown art glass bowl vase, cobalt blue / crystal clear wave

Retro vintage blown glass vase with shaded cobalt blue and crystal clear glass, and wonderful irregular wave shape. This measures 3 3/4" tall, 4" in diameter across the rim. It's not marked at all that we could find, and we have no idea as to the maker, sorry! It is in excellent shape, without damage or scratching.