The Frederick Warren Art Glass Studio Tumbler in Blue Ocean Tan Iridescent Swirls from 2001 is a vintage round glass tumbler with a glossy finish and swirl pattern. Made in the United States by Art Glass, this hand-blown glass piece is signed by Warren and features an engraved backstamp. With a color of ebony, it is a unique and collectible item suitable for all occasions, perfect for any unisex adult looking to add a touch of artistry to their drinkware collection.

Beautiful glass for sure unique. It’s a light blue sort of iridescent brown look to it. Reminds me of the ocean floor or a lake. Very sturdy glass. Says Warren 01 under