Ku klux klan pendant type object

My great grandmother gave me this item, it was her fathers who was a member of the ku klux klan, I myself am a Hispanic American so it is not really an item of my interest to keep I know there are collectors out though who may serve better use to such an item so I was trying to see how much it could potentially be worth if anything.  The top part appears to look like a night looks like it could be hung like a necklace and the circular part has markings when the circular part is spun fast it creates a little mirage image of a cross surrounded by the three K's from the markings on each side.