[MOST IMPORTANT DISNEYLAND HAUNTED MANSION AUCTIONS OF ALL TIME
Two additional items to highlight:
LOT #95012: As far as I know (my info came from the source of both the posters and also in talking to Marc Davis), there are only two Mansion Original Attraction Posters extant that are signed by Marc Davis. This is one of the two.
LOT #95315 This is actually a rarely scene brownline architectural rendering.]