you dont ...

and it's a serious case of the blind leading the blind....and the biggest game of chinese whispers...

new guys read it on a forum and think that's what its about, what do you expect with so many ('pocket guru's' regurgitating what they read yesterday as gospel) ...without realizing just how many are just re-polished to look a bit like unpolished ...let alone this new fad for adding metal and repolishing that allows three times a week an unpolished watch sale LOL....

when even Geneva are laser welding repairs in, it just makes it comical .......

a true unpolished case can take years to find and will command a serious premium and in reality is an unacheivable goal for most...not to mention really only for those that dont want to wear it ....if the hobby is about that then its going to be about a very small pool of watches LOL.