What is the rarest Tomy/Plarail/TrackMaster item you own?

I also have data for past auctions, that is a public database so it is OK to share anything if you want. Some of the auctions might not be recorded, but most of the major auctions are kept. Not the most reliable source to determine rarity because the titles and contents might contain 2 or more items, but you can make somewhat wise decisions.