hattiesburg mississippi

OK, I am hoping someone can help me figure out what this is... It is made from aluminum and measures 1 5/16" across and has no makers marks on the back. It appears to have had something attached to it right across the middle and I was thinking a Pin like to attach it to your lapel, but that is...

I had the privilege of getting out to do a group hunt with the South Mississippi Relic team yesterday and managed to find my 1st Silver Coin of the Month/Year which was a 1942 Mercury Dime and also my 2nd Gold Ring of the Month/Year, it was made by Town and Country and Jewelry Import Company...