A very rare mark on an unusual antique art glass vase from England. Deep acid etched or carved signatures under base "Webb" in a curved cartouche, opposite "Tiffany & Co" in its own deep curved cartouche. I have never seen this sort of signature except on Thomas Webb Cameo glass related to the 1889 Paris Expo. This piece is gorgeous, different, and a smaller size so perhaps a smaller mark.White inside, cased multicolor middle layer and a clear exterior glass. Wonderful crepe sort of internal texture. Great colors, pleasing form, an intriguing piece that I can not find in any book or website. Impossible to price, reasonable offers will be considered. The item "Rare Webb Art Glass Carved Tiffany signature 5.25 Vase Spangle Crepe Rainbow" is in sale since Saturday, August 1, 2020. This item is in the category "Pottery & Glass\Glass\Art Glass\British\Other British Art Glass". The seller is "johnsmolen" and is located in Olympia, Washington. This item can be shipped to United States, Canada.