A rare and interesting 19th century French tortoiseshell singing bird box automaton, most likely

A rare and interesting 19th century French tortoiseshell singing bird box automaton, most likely by Blaise Bontems, Paris, of rectangular form with oval hinged white metal cover engraved and overlaid in Coloured metal with two birds and foliage, opening by sliding button to reveal the iridescent song bird mechanism and foliate pierced and chased grill, and within gilt herringbone chased surround, the base with winding aperture, the rear with hinged section holding the key, 9.5cm x 6.5cm all housed in a fitted and plush lined case with retailers details for S Greenough & Sons, Bolton