How to identify HP-49g+ production runs

[gwh]

(11-24-2022 11:34 AM)gwh Wrote:  I'm not at home right now but the last 50g I acquired (Black CNA 4471HKN) has a small inscription molded on the back that my other 2 (Black CNA 74208650) don't have. Something like "hp49gplus(B)".

Being home I managed to get a picture: https://photos.app.goo.gl/QqFem68gAGXEJ8vj9

The inscription reads HPK-49GPLUS(B) and it has an additional |C logo.
It's the only one I bought (from Spain, on Vinted) with a much better, I guess newer canvas pouch.
I had a white & blue 50g that didn't have the marking either.

I can't feel or see any notable difference, yet again I'm no expert at all.