Gold Musical Seal with Erotic Automaton

An early 19^th Century Swiss gold musical seal containing an automated erotic scene.  Oval musical movement.  Situated above the movement a polychrome scene of a couple who spring to life when the music plays.  Centrally wound by the top ring through the free-standing superstructure of gold representations of serpents.  Decorated oval band, hinged seal which conceals the scene left plain.  Lateral slide to control musical train.