I've had a few different versions of "Pocket Signal Disks" along the lines of this one, and will always grab them when I find them as who knows when knowing morse code and semaphore might come in handy??? (Plus I love the design and the slogan "be prepared" and it is fun to turn the dial.) This one dates to WWI and features two arm semaphore and gesture signals on one side, and international morse code on the other. A cool thing, and if not to be used to actually practice one's signaling methods, perhaps inspiration for some sort of party game!
5 13/16" x 3 1/4" and in very good antique condition.