Pin-back button

Pin-back button
Title
Pin-back button
Medium 
Metal
Dimensions 
Overall: 1 1/8 in. ( 2.9 cm )
Description 
Circular metal pin back button inscribed in white block letters on blue ground: "ADA"
Object Number 
INV.6757.1
Due to ongoing research, information about this object is subject to change.
Creative: Tronvig Group