What's the rarest or most unusual computer-related item do you own?

12 Jan 2017

...
  Given the topic, I have this rather *unique* punch
card reader, if you want
 to call it that. It is marked EAI but that's where the trail turns cold. 
EAI is Electronic Associates Inc. based here on the NJ shore. They made 
analog computers.

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What's the rarest or most unusual computer-related item do you own?