and I thought it was easy!!!
I have nearly 20 16520 bezels on hand from R serie to P serie.
According to general belief, there are 4 'main' series of these bezels but from what I look carefully of these bezels I think there are about 4 'variations' of the 3rd serie.
I want to be sure before I post pictures and my discovery here.
So guys please post all your 16520s and do state which case serial it has (this is important) just the serial letter will do.
I will gather these info and disclose my findings once done.
This will benefit us all to better understand 16520s.
A few of you have posted your 16520s and it has been a great information.