The vent bezels I have pictured don?t show any evidence of dark charcoal metallic and nor do they show any evidence of ever being repainted. That?s what confuses me.
Sorry should have been clearer and more correct in my first response.
What does the back side show?
There is the possibility that these were made by the same provider as the gauge surrounds and got the same coating. As discussed in another thread you can see the blue tint to the paint I referred to above on the side of the example below. As mentioned this built up to a pretty flat black similar to the process for the exterior black out areas on a Mach and Boss
Sorry I don't have a vent to compare in person