This is a lot of three Sigma Nu fraternity member pins, all of which are made of 10 karat gold. Two of the three pins are engraved on the back, with the largest pin not having any markings.
The smallest pin is etched “RNM Gamma Upsilon 43” and the middle sized pin is stamped with the Balfour hallmark and engraved “Gamma Upsilon letters, J.W. Perdue 621”.
The pins weigh 14.67 grams.