Military International Morse Code and Pocket Signal Disk

Description

This Disk has a lot of information on both sides.  One side is the Two-Arm Semaphore and the other side is Be Prepared. It  measures approximately 3" by 6".  It is in a highly
used condition with one corner folded over. Everything seems to be there, but I am not sure how it works because there is a place in the center of each side that moves to show
something different.