A 1970s Pennwhistle 103 acoustic coupler; it's very angular painted sheet metal, rubber and satisfying metal switches
https://media.hachyderm.io/media_attachments/files/111/897/603/747/653/086/original/40cfb643daf1b2b1.png
This is my favorite era of Computer design, it's kind of Dieter Rams meets Soviet space probe engineer
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