For your consideration is a vintage WW2 US Army military collar disk insignia.  This one has a screw back and no marks for manufacturer.

I have recently acquired an estate with a lot of military pins, awards, etc.  The gentleman of the estate was in WW2 and his father was in WW1.  Items are listed as found.  I have not cleaned them.  Check my other listings for more from this estate as well as other vintage, antiques, collectibles, fabrics, clothing, holiday and more.