There was a video posted by "Michigan Metal Detectors", (no other name) in which he found a lapel pin with a circled E in the center. I have an identical one that my Dad left me. He was building aircraft engines in 1940-1942 at Allisons in Indianapolis and the pin was an "excellence" award from the Army Navy production board. Thought I'd pass that on in case someone here knows who Michigan Metal Detectors secret identity is.
MrGee
MrGee