Turquoise Set Musical Pendant

An unusual 19^th Century Swiss musical movement in a turquoise set gold hunter case.  Circular gilt musical movement with a large barrel driving a pinned disc engaging with twenty tignes.  Gold clip on cover to the movement chased and engraved on a matted ground.  Gold hunter case decoratively chased and engraved, set with turquoise on both side.  Small aperture on the back for the male key, the front cover opened by a button in the gold pendant.  Gold key with male square.