The Contact Systems CS-400C was the keyboard to a component locator machine with automatic cut an clinch, produced from 1988 through 1992.
My keyboard was dated 11-28-88.
The keyboard has Futaba complicated linears and a single Futaba linear locking switch for the Shift Lock.
Another shot from above:
The keyboard uses an Intel 8031A-P controller, and has a EPROM, which can be erased with UV light. The ROM chip appears to have been last updated 11-30-88, 2 days after the keyboard was manufactured.
The caps are very similar in height to row 3 SA caps, though slightly shorter, and a bit more square on top. They have a nice iron cross mount on the underside and are very thick doubleshot ABS.
Comparison to SA Caps:
Finally for those interested, a typing test video so you can hear how it sounds.
Thanks to Engicoder for helping me do some of the digging and giving me the scoop of parts of this board