This 200 kg piece of vintage hardware with the intriguing keycap profile was spotted by OnlineLion in a museum. As cerement points out, it's a Berthold Fototype Diatronic phototypesetting machine.
We hadn't had that much time left until the museum had to close. But it was in an area that was about printing – OnlineLion.
The "Fotosatz" part seen in many photos is misleading: it isn't a nameplate but an 8-character display showing the last characters you typed.
The 8-char display
This is explained in the brochure, and Marcin Wichary has a tweet about it in his awesome thread on tiny (and expensive) screens from the 70s/80s as well:
A Berthold typesetting machine came with a beautiful and unique keyboard – and in the periphery, a “screen” that felt more like a calculator display, with room for only eight last characters you typed. pic.twitter.com/hLy1ZSCxOz
Daniel shares with us some of the fruits of research into computer keyboard history conducted over recent years. In this case, the surprising variety of methods by which keyboards determined which keys are being pressed.