Originally Posted by BeanTown

Pins, buttons, and Disc are all nitche items which will slowly gain popularity. Very undervalued over the years and as collectors are looking for items they don't have of a key player (like Cobb), they will start collecting these kind of items which will make them more mainstream. We saw this happen with the postcard market over the last 15 years.

There is a great book by Muchinsky "Baseball Pinback Buttons". The book doesn't show everything out there, but it's a great reference guide to educate collectors who want to start collecting these kind of collectibles.