One of my nice finds this weekend was a cup plate for my little collection. This makes #15 in my little collection so it's quite easy to find things I don't yet have. Many of these are identified by a book called "American Glass Cup Plates" in which the authors give each unique style a corresponding number. Collectors refer to that as the Lee & Rose number. First I find a picture in the book that looks like the cup plate I've found but often there'll be more than one version that look nearly identical. I ID your cup plate you often have to get out the ruler for a precise measurement and count features, most often the little bumps along the edge of the plate. It's rare that I pay more than $10 for a cup plate so it's a very affordable hobby though if I wanted to get into the colored ones it would get a fair bit more pricey.