Turban shell cup; Knobbelhoornbeker with gold-plated silver frame; Knobbelhoornbeker with gold-plated silver frame. On the vaulted lid with driven leaf work a triton half-body with harpoon in the right hand and a shield in the left hand. The shell is carried on the back of a kneeling Neptune; holding a trident with both hands. The pedestal consists of openwork; stylized tendrils; on which a plate rests with driven waves. The shell is encased in figural cleats with rolling gear; the mouth rim is surrounded by a broad border with etched representations of fighting and free tritons; a nereid and sea monsters. In the lid the Backer coat of arms; placed on a ground; already present coat of arms. Under the bottom plate the same weapon; a private label and the initials GB; (story of) Neptune (Poseidon); offspring; companion (s); train etc. or Neptune; J鰎g Ruel; Neurenberg; c. 1600 - c. 1625; silver (metal); gilding; h 48.4 cm x w 19.1 cm x d 19.5 cm