Ang-EC and pcrdude are the only ones I have seen as well with a black base, and not sure where that came from, but most of the bases are just the polished looking metal.
As for the bases, I think the ones that come with the tanks will not say anything. I also did not see any engraving on the replacement coils either, so I am not sure if the replacements have any indicator as to what ohm they are.
As for the bases, I think the ones that come with the tanks will not say anything. I also did not see any engraving on the replacement coils either, so I am not sure if the replacements have any indicator as to what ohm they are.