The vintage travel poster market is old enough to have developed its own pathologies. What began as nostalgic accumulation in the 1970s — former railway employees, tourism board retirees, people who remembered the originals in context — has evolved into a structured secondary market with auction records, condition grading systems, and a small number of dealers who have spent decades building expertise the books don’t contain. Understanding what drives value in this market requires understanding both the history of the objects and the psychology of the people who want them.