The brown stuff that looks like paint two posts down is glue. I'm fairly certain of it now. I took a good close look at it with my lighted magnifier (SUCH an awesome tool) and it's definitely not paint; some scrapings of it show that it has fibers inside it, not just on top from later layers of wallpaper.
As I mentioned in a previous post, an interior designer friend who has done dozens of period interiors is pretty sure there used to be lincrusta there based on what she's seen. I've shown her pictures, wide angle and closeup, as well as my little flakings from scraping a bit of the brown off the wall.
I wish I had a million dollars--then I'd go ahead and put it back. But I don't have a million dollars, so it's getting painted. Maybe someday. :-)