Found a great quote :
Quote:
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Butterfly clutches are sometimes known as dammits, especially in military circles, after the phrase one says when one belonging to an important badge or medal is lost.
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Date wise , the Americans started routinely using butterfly clutch pins late WW2 and no doubt examples were seen in numerous countries , so in theory they could have been used in Britain in the late 1940's or early 1950's.
Dating Metallic Insignia: Clutch Fasteners
Will need to do a bit more research and try to date when they were used on other badges.
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