Vintage Stop‎ at two Association for Voluntary Sterilization Pinback Button Pin

Vintage Stop at two Association for Voluntary Sterilization Pinback Button Pin The pin on the back is bent so the button does not lay flat Has some wear to the front and back Approximately 1.25" diameter Please note the item is vintage and will have various degrees of wear. This button is from my Grandfather's collection. He was known as "The Button Man!"