Stop at two button

Object Number: 
Diameter: 1 1/4 in.
ENVIRONMENTAL ISSUES Metal pinback button with red background and white text. STOP/AT/TWO [probably relates to population control], Image: octagon. On crimp: ZPG BOX 259, NYC 10014
Credit Line: 
Gift of Ralph W. Nerbel
Due to ongoing research, information about this object is subject to change.
Creative: Tronvig Group