1955 GSLSA Enamel Pin Brooch with Scales Of Justice and Feather Quill Pen

Very nice looking pin with that reads 1955 GSLSA and features the scales of justice over green enamel. It also features a feather quill pen in the background, however I was unable to find what GSLSA means.

Condition: Used with minor marks and a small enamel flaw in left green area. Please review all photos for exact condition of item and size.