For your consideration, here is a Vintage Dictograph Sentinel 3 Surveillance System Cloth Woven Patch.  It has very little wear on it.  It has not been sew on.  It measures 4 3/4 inches tall by 3 7/8 inches wide.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (417.785i-.3ob)