1948 Sigma Alpha Iota 10K Music Fraternity Pin. Sigma Alpha Iota is an International Music Fraternity. It was founded on June 12th, 1903 at University of Michigan, School of Music in Ann Arbor. This pin is from the Beta Gamma Chapter. Beta Gamma chapter is located at Bradley University in Illinois. Set on the front are 15 pearls. Engraved on the back: Beta Gamma 4-14-48 A-16728 Lois Beam Baker Clasp Style: Knuckle Clasp Weight: 3.8 grams Measurements; Pledge Pin: 3/4" long by 1/2" wide Chapter Pin: 3/8" long by 3/8" wide Connecting Chain: 1 1/2" long This pin has no gold stamp. Its been acid tested and will be guaranteed as 10K gold. This is a vintage item, it was previously owned. It will have regular wear, such as light surface scratches on the gold. Overall it's in great condition! Please see photos for the most accurate description.