A gilt metal and enamel singing bird musical box, unsigned and unnumbered, probably German, mid 20th century, the movement with double bellows and a plastic paddlewheel governor, operated by a lever to the front releasing an oval cover painted with a scene with 18th century lovers, revealing a pierced interior with a coloured feathered bird, the cover continuing the scene, the sides with landscape vignettes on blue grounds with engraved bands, 10cm (4in) wide, with a stylised bird profile key