This is a very rare signalman’s patch for a tunic (this would generally be worn on the right arm just below the shoulder) for a man who filled that role in a Machine Gun Abteilung. It is for the feldgrau tunic and features crossed signal flags. Three tiny holes appear (no bigger than pinpoint sized) where this patch might have been mounted by a collector long ago. You have to look closely to see them. They are not detractive. The patch dates from the period of 1910 to 1914. This is very rare and difficult-to-find!