For pinball, a Twilight ZOne and a Tales of the Arabian Nights
PCB boards, the rarest I have is an unreleased Punky DOodle with marquee and side art, and a unreleased Tenth Degree
Arcade machines...hard to say, I have a Gauntlet Dark Legacy and Blitz 99 dedicated that have never been on location, classic games: dedicated Donkey Kong Junior, Dedicated Mario Bros Widebody, dedicated Dig Dug, I mean, it's random, really