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