Catalog:Domino Crown

The Domino Crown is a prize that was awarded in a 2007 contest in which players had to build a course of falling dominos. Only 13 were awarded, (with one exclusively given to Pieperson50 during his visit with contributions from the Make-A-Wish Foundation.), making it one of the most rarest hats on ROBLOX.

It is also noted that the user DarkUdog sold his to TheGamer101 in September 24, 2011 for 1.3 million ROBUX. It is one of the most biggest ROBLOX sales in history.

This is true because DarkUdog uploaded a video of him selling it here: https://www.youtube.com/watch?v=uCnnhWMUGHQ

However, this is not the rarest item. For example Telamon Hair had 3 copies which sold for  at the best price and ROBLOX tablets which are nearly unobtainable.