I don't believe any one accumulated much of anything until well after World War II. In the early 1960s, there
were people collecting Rookwood who weren't even necessarily aware what they were doing. They might have known that it was made in Cincinnati and that it was pretty neat, but they did not have a lot to go on. By the early 1970s, there were new collector books in a large number of areas that spurred attention, and then museums got involved and held major showings of things that had fallen out of fashion, like
Rookwood and Tiffany. That's when it really kicked into gear. By the late ��70s, prices had gone up dramatically, and since then have cycled up and down and up down, dependent on the economic system.