Silver singing bird box in its original case. Very unusual piece. Very well and deeply engraved solid silver case, including the underneath. Decorated with flower motifs. Most unusual song and long duration for a spring movement box ( nearly 20 seconds). On pressing the operating lever the lid opens and the full bodied bird pops through the grille & begins singing. It has a moving ivory beak, the bird turns, flaps his wings and tail and after his performance pops down through the grille & the lid lowers. Unusual movement signed OMM. Probably Swiss, circa 1900. 3.75 inches wide by 3.25 inches deep by 1.5 inches high ( 9.375 cms by 8.125 cms by 3.75 cms).