The house at Overbeck's

The rejuvenator
The collection at Overbeck's is home to a number of different models of Otto's electrical rejuvinatory. The 'supreme' model of the 'Overbeck Rejuvenator' would have cost £12 in 1930, equivalent to about £350 today.
The polyphon
This wonderful Victorian music box made in 1898 is an example of a byegone music machine. It was made in Germany and imported to the UK, where it was bought by a pub not far from Overbeck's. Otto Overbeck's used to hear the polython being played at the pub, and loved it so much that he offered to but it from the landlord.
It plays large steel discs, with slots punched in the front face; each of the slots represents a musical note. When punched through, the slots create little metal tags on the reverse of the disk, and these tags interact with the polython to produce music. Inside the polython is a combe with metal teeth, which catch on the tags to play a note.