HP 41 - Strangeness

[GentlemensVintage]

Hello all. I am brand new to the forum and a huge HP Calc fan since my first encounter with a 19B in the late 1980s.

I recently acquired this 41CX and I am baffled by it. I think it is a CX due to the serial number (2744@20155) Do you notice anything odd about the keyboard? The keys are missing the printed functions. I have never seen this on an HP. Also, the bottom of the calculator where it would normally have the model number only shows Hewlett Packard and the Logo displayed. See the pics. I would love to hear if any of you have seen this on a HP Calc before or can shed any light on this calculator.

https://drive.google.com/file/d/1HYChkFH...sp=sharing
https://drive.google.com/file/d/1ZnoUjtr...sp=sharing
https://drive.google.com/file/d/1vycgeYq...sp=sharing

Happy Holidays,

Will