HP 41CX Auction - Rare Variant?

[twoweims]

I just bought a strange one, too. It was advertised as a non-working 41C from the original owner.
The front half is a very nice tall keys 41C but the back has a 41CX Sticker on it with a very late serial number. and even stranger is that the 41CX Back half has the brass contacts in the charging port.
Maybe it got sent in for repair at some point and got a new back?

I have turned it into a true working Frankencalc by installing a 41CV Motherboard left over from a CL conversion and a new Calculator Store zebra strip.