The wappen is held on by split brads which can be seen on the inside pic. The liner is definitely the problem.....if you look at the first pic (side view) in the listing you can see that originally there was a liner stitched in the usual way all around the rim. You can see the row of original holes in this pic. You can also see that these have been cleaned out and that some one has tacked stitched the present liner around the rim every 4-5 holes. They have also doubled the thread in these stitches. Obviously, then there has been some extra work done on this piece. That new thread would probably "light up" as well. Looking at the inside liner....the edge still remaining is "poofy" and not crisp as it should be if this were original. I agree, it looks like someone has deliberately torn out most of the liner which is a replacement. We know it is a replacement due to my first observations above.
More....looking at the interior, we can see that the tack stitching was done by hand, you can see large knots tied at the beginning and end of the doubled thread. We do not see these on machine stitching. Why the extra strip of green cloth under the liner??? I have a Prussian (brass) filz helme with a similar strip of cloth sewen along the edge of the liner and hidden when it is folded down and in. However, this cloth is white, the liner is oil cloth and it is stitched right round the shell as it should be, none of this tack stitch business.
Ron