At 10.0 mm, this specimen is not fully mature, it is still slightly juvenile. This is why I have not graded it - there are no imperfections, but a juvenile shell cannot be graded. Despite its slight immaturity, this specimen is still a great opportunity to add this extremely scarce species to your collection!

Note: There is what appears to be a small piece of sediment within the aperture; it could likely be removed with care, but I’ve chosen not to risk any damage to the shell.