A late 19th century German silver singing bird automata music box

A late 19th century German silver singing bird automata music box, maker's mark for J D Schleissner and Sohne, in the manner of Karl Griesbaum, of shaped rectangular form, the top with oval hinged cover decorated with a figural scene, opening to reveal a feathered automated bird and pierced grille, the box repousee decorated with birds amongst scrolling foliage, with applied opening catch in the form of a bird, stamped 930, 10.2cm wide