Girl Scouts World Trefoil Pin
Many pins have a letter on the back but this one does not.  This is an older model as it does not have the modern safety catch on the straight pin
Blue and Gold Tone
Measures approx. 3/4" in diameter

About the pin: It shows that you are part of the World Association of Girl Guides and Girl Scouts (WAGGGS). On it are three leaves representing the Girl Scout Promise, with a flame that stands for loving all the people in the world. The compass needle is to guide you, and the two stars are the Girl Scout Promise and Law. The outer circle represents the World Association, and the golden yellow trefoil on a bright blue background stands for the sun shining over the children of the world. 
Center this pin above the Girl Scout Membership Pin. Place it in the same position on the insignia tab.