Marking:  Roman capital N within a circle (cameo) (Nuremberg, in use in the 17th century). See Marc Rosenberg, Der Goldschmiede Merkzeichen, Frankfurt, 1925, Vol. 3, p. 41, no. 3761;  H B in cameo (Maker's mark of Hans Bott, master 1627, died 1659) (See Rosenberg, p. 163, no. 4095) Location of marks: , . On the back of the bowl near the stem.