Old enamel Phi Delta Chi fraternity pledge screw back pin.   1/4' x 1/4".  In good condition - may need a good cleaning.  I do not clean vintage pieces I leave the original patina on it, so it might need a good cleaning.   I have other collectibles in my eBay store and feel free to take a look.  Once again thanks for taking a look. Guaranteed to be 10K gold. Measures roughly 1/8” x 5/8”.