I remember reading somewhere a suggestion (and that is the context in which this should be considered) that a back plate would have a dual purpose a) to identify the munitions factory the woman was working in and b) given that the badge was triangular with sharp corners a back plate protected from the badge digging into a persons body preventing injury. Whether this is true or mere fanciful speculation I am unable to say but an interesting idea nevertheless. However I would think that if there was grain of truth in this the idea would have been adopted by other factories.
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He who can no longer pause to wonder and stand rapt in awe, is as good as dead; his eyes are closed. (Albert Einstein)
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