Board Thread:Skyrim/@comment-108.208.223.172-20150802171316/@comment-1738746-20160708070139

If Arch-Curate Vythur was wearing it, and you have no mods specifically affecting him or the crown, might I assume you're using one or several Unofficial Patch mods? Because of those "fixes" the crown issue and re-adds it back into the game this way (or via other ways).