From the Hack-a-day blog, a 1964  Livermore Data Systems Model A acoustic coupler modem, complete with original wooden box.  On the web.  Surfing up Wikipedia.
 
Here's the movie.
 Its not even a digital modem, its strictly analog. For some reason, this is the coolest thing I've seen in ages. Maybe I should get out more, eh?  ~:D
 
The Phantom
 
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