Sort of OT, but do you have a guess on the ID of that? I have one with very similar in structure to the one listed in the auction, but different color. I was thinking it may be Favites micropentagonia, but I'm not sure. The coralites on mine are 3-4 mm in diameter. Mine doesn't resemble Micromussa (to me, anyway) and I can't find anything in the genus Favia in Veron's book that looks like it either.