Official governmental nomenclature for each adapter are;
ADAPTER, GRENADE, PROJECTION M-1
1944 Dated adapters are produced by J.J.N. - 15, 1944
1945 Dated adapters are produced by GML 47, 1945
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They look great and are in fine shape. Yes, there's some wear but they're very old and these things get that way even in storage. They are great display items. Excellent deal and I looked around for quite a while.