Lidded perspex box with metal lid - by WMF

A rare perspex box with silver-plated lid - by WMF Germany. Around 1968. The object is marked at the bottom with moulded WMF-sign. Width approx. 4.4', depth 3.5', height 2'. Minimal traces of use, one tiny crack at the perspex/ near the hinge (which does not effect the function). apart from that, ingood condition.