So the two versions of the mic part I have gotten are different in a few ways;
The one on the left is one I ripped out of a VOM mic and used the sleeve from the one on the right which was sold as a part for VOM mics.
The mesh and the color that is put in the center inner cone are the differences that matter.
So which is correct for which costume/film?
The one I've put together on the right I believe is how the Han ANH looked; with the sleeve, light mesh, and red center.
Here is a color boosted shot which I believe shows reflections from the red center. There are lots other images that show the holes can get blown out in high lighting or flash from certain angles. This I think would only be possible with the light mesh.
Now Zombie Killer pointed out this part was used on Chewbacca's bandolieer so I went looking for reference.
Here is a great shot which shows a red center which I think makes it even more likely they had two of the same parts and this is. The same style used on Han.
The ESB bandolieer looks like it might use a dark mesh version, though it could easily not be. Do we think Han ESB belts used dark mesh versions?