WWII hat pin? Value?

[Dirty Digger Doug]

I went to a estate sale today and found this cool eagle hat pin (i believe) with screw stud on the back. It is marked jr gaunt London with a monogram below it. It's brass. Don't know if it's real or reproduction. Anyone have more information and a value?

 

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[jewelerguy]

the nut on the screw post doesn't look like typical WW2 issue. I think it's possibly post war issue or that nut is a replacement someone just put on it. Either way, lots to be had in the 5-10 dollar range