I’ve started collecting these, really as display items to show next to modern hearing aids.
Look at these: 

This first one looks pretty horrific – I think you were expected to wear the steel ear-shaped piece in your ear (pretty heavy, obviously hard – it’s sitting in the box in the photo), and then hold the large hand-held microphone towards the sound source…

This one is a horn, but really neat (about 2″ across) 

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