The difference between the gen black bezel is the numbers aren't painted on (as is the case in the rep) The numbers/markers in the gen hollowed out in the ceramic bezel and then filled in with a Chromium nitrite compound and then the bezel is smoothed around the compound and the ceramic to make it flush. It is definitely not painted on. The chromium nitrate compound used for the numbers is extremely hard, harder than the ceramic bezel around it. This is for the black bezels . The LM blue bezel is constructed in a different way using zirconium oxide (LM) but again it is hollowed out markers and numbers and is smoothed later. There is no way of removing the numbers on either, you would have to destroy the bezel to do it.
Unfortunately this is a case where the reps are just mimicking the look, they certainly didn't go through this process.....but I would've hoped they would use more durable paint