Can anyone id this Life Jacket ?

[mossie]

After having a sort out in the loft,I found this in my collection,Can anyone offer any information on it,Is it civilian,merchant navy or military and what year would it have been issued ?

Thanks for looking.

Mossie.

[gel65]

Looks like it is American but not sure that it is military I know some of the life jackets produced where orange or yellow and usually dated which leads me to think that this is a civilian life preserver

[harryamb2]

I think I have seen pics of USN guncrews wearing them.