That's a "data entry" beamspring. Fairly common, as far as beamers go.
https://deskthority.net/viewtopic.php?f=62&t=1113
The keys on the right are the same as my regular Display Station beamspring. Someone spelled out what they did on DT at some point but I quite forget. I use them for Page Up/Down, Home and End.
https://deskthority.net/viewtopic.php?p=494767#p494767
