All the medallions can be seen on the Pictures of Arlington Facebook page.
Dennis Ahern writes with more information about this little display:
“The curious framework is a California Job Case of the kind used to contain
foundry type for letterpress printing. The back (bottom) of the drawer has
been removed. In a California case, the left two-thirds contain the lower
case letters and punctuation, and the right third has the capital letters
arranged alphabetically except for J and U, which are tacked on after X, Y, Z.”