WW2 Double Sided Pocket Signal Disk with Semaphore and Morse Code religious sampler Mid-century I believe

Mid-century I believe

with the introduction by Hesse added in 1927

though in all likelihood were made in Hingham MA

and pithy descriptions of their version

WW2 Double Sided Pocket Signal Disk with Semaphore and Morse Code religious sampler Mid-century I believeI'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??? This one dates to WWII and features two arm semaphore on one side, and international morse code on the other, with dials turning smoothly to show an array of flags, codes and signals. A cool thing, and if not to be used to actually practice one's