I think the fanciest/oddest item I’ve got is a first edition pressing of Blue Oyster Cult’s Imaginos album.
Sadly there was a mastering issue with the first editions, where the volume level on a few of the tracks is too low. They corrected it on the reproductions (after vinyl got big again a few years ago). The Imaginos album wasn’t well received though, so even the reproductions are hard to find.