This glorious piece of industrial vintage was found in Tokyo at a wonderful antique market.
A heavy metal egg mould that would’ve been suspended on two brackets and spun by the wheel on the top, most likely for chocolate the spinning motion would make sure that it coated about the front and the back.
This would make an absolute wonderful and very different egg rack for the kitchen . Or just a decorative piece on display.
Measurements: 
19cm wide x 8cm high x 30cm long (closed)
36.5cm wide  x 8cm high x 30cm long (open)