How to identify HP-49g+ production runs

[Eric Rechlin]

I did a post about the various 49g+ keyboards here:

https://groups.google.com/g/comp.sys.hp4...Ss6oJkyIYJ

I am pretty sure production of the 49g+ stopped in 2006; I don't know why Wikipedia says 2008. My guess is production of the 49g+ stopped once production of the 50g started; my earliest 50g has a serial number starting with CNA611.

One other major issue with the 49g+ is the gold paint on the faceplate tends to deteriorate over time, so look at the photo closely before buying one.