Clear Crystal Glass, Borussia-Glass, White enamel cameo glass, black overlay, glass cutting. This covered sugar bowl was made by an as yet, anonymous artist for the Carl Schappel manufacture, model #6747 Haida, Novy Bor, Czechloslovakia. Could be a stunning ring and earrings jar.
The bowl, a renowned model, is widely published. See page 192 The Glass of the Architects, /Vienna 1900-1937 Franz, MAK Glass and Ceramics Skira as well as Image 339, 340 P. 326 Glas 1905-1925 Waltraud Neuwirth.
An exact example is in the permanent collection of the MAK Museum of decorative arts Vienna.