I recently came across a rather strange HP beastie. It is an HP41CX blanknut, but the upper rows of keycaps have the shot molded legends. These keycaps on a standard blanknut do not have shot molded legends.
The keyboard background is a standard blanknut unlabeled black. The front label is gold and just says "Hewlett Packard" without any "41CX".
This unit came with an HP-IL interface to a custom data acquisition box.