I found this item at an estate sale and they said it is a WW2 D-Day life preserver. From looking at it I can't figure out how it would preserve one's life. It has "Oct 18, 1944" and "Durkee-Atwood Co." stamped on it. Is this genuine? It is in remarkable shape and obviously never been used. How does one associate it with D-Day? Thanks.
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