According to M&R only 30 progression sets are known to exist.

What is a progression set? A progression set provide samples taken  during the manufacturing process of the medal, in this case here, the Official Hawaii Statehood medal.

Here are some recent images of a set in my collection. I tried to focus on a specific area of the medal to show the creation of details of the medal (high relief medals require multiple strikes). No image was taken of the blank planchet. The first three strikes are in brilliant bronze.  Focus on the lei details…