How to recognize that a 16520 has been polished ?

[athom]

Hi mate, I was thinking a bit further than to create every day new posts in order to ask you how you like the condition of all the black 16520 daytonas I've found...So this thread I created here is to ask you "How to recognize that a 16520 has been polished ?" I can tell you if a 5513 or a 1675, etc... have been polished but I can't even see if a 16520 is over polished and that it getting on my nerves...so please help me !

Also I'd add how to recognize a service bezel ? And for what variation.s is the bezel with long / short 6, I don't know how to call it, just have a look at the pic attached.

Many thanks for considering my request and stay safe mates !