I've always wanted to try pipes so I finally am, and having some fun trying to restore a few as well. I hope the picture downloads. I bought a Dr grabow cob cheap on eBay partly for the look and for the history (sort of) factor. When I received it there was a whole section darkened, clearly filled with something. At first I thought it was a loss, not knowing what I would be smoking, but as I look closer it is the same substance the top is hardened with and some other older ones seem to have. Could it have come that way. I also wondered if it was just wood glue. Any ideas.