1913 Bath House Inventory, p. 133, no. 659, in the safe.
1914 Wernher Inventory, p. 89, no. 443.
M. Rosenberg, Der Goldschmiede Merkzeichen, Frankfurt, 1925, vol. no. 3952, where this piece is cited and mention is made of a galvanoplastic copy to form the double cup.
Vienna, Goldschmiedt Kunst-Austellung, 1889, no. 502.