REX is Rex Atheletic Club
413 1/2 Main St
Joplin, M0, 1936
E Vaughn
Ihave 4 colors including a maroon same as yours except $1.00 on back, also two diamond molds.

I would not be surprised if the address is not real close to the Empire Buffet. I have several different that was sent there. Carol Hardwick and friends.