How to identify HP-49g+ production runs

[dmh]

My subjective observations of my new (to me) 49G+ with serial number CNA436 which makes it 2nd generation according to the previous responses.

After initial casual use, before reading the responses here, I thought the keyboard felt just like my 50G.

Side by side use, since reading the detailed responses here:

• the keys sound different to the 50G but are not that loud
• the face of the keys does feel more plastic like than the 50G
• the key motion feels the same as the 50G
• keyboard test passed without any issues
• no keyboard issues with further use
  

The 49G+ is in very good condition so maybe the keyboard will get worse but it won't be my daily driver.