Unknown US Lapel Pin - What Is It?

[VMI88]

I picked up this lapel pin a few days ago because it's obviously old and probably military-related, but I have no idea what it is. Any help would be appreciated!

 

 

It's about the size of a GAR or American Legion lapel button but it fastens with a single screw post and nut on the back.

[268th C.A.]

Looks like a sweetheart pin too me...WW1 era

[USAFnav]

I agree, looks like a sweetheart piece, but who knows? Very nice, thanks for sharing that.

Pete

[VMI88]

Thanks - I just thought the "US" was a little unusual for a sweetheart pin. Usually they have some sort of insignia or other design.