Just FYI, there is also a very easy external way to discern between a 1st generation PW, aka PW1, and 2nd generation PW2. Which large logo they have centered on their back:
PW1 has a large recessed/matte "Kindle" logo on its backside.
PW2 has a large flush/glossy "Amazon" logo on its backside.
I listed some other differences e.g. in packaging in my
PW2 review.