Handed to KC in 1989 by the widow of a retired (IBM?) engineer. The model is a 1964 Livermore Data Systems “Model A” Acoustic Coupler Modem.

KC explains

“Even better than seeing it in a museum, I decide to hook the trusty Model A up and make it talk to something. After some trial and error, I manage to get it to talk to a terminal server at work and use it to connect to a linux box. It’s ALIVE! So, 45 years after it’s creation, this antique modem gets to send data to and from the modern Internet.”