The Vintage American Society for Training Development (ASTD) Lapel Pin is a collectible pinback that showcases a nostalgic piece of American professional development history. This lapel pin likely holds significance for those who were members of the ASTD, representing their membership and involvement in the organization. The pin serves as a subtle but meaningful symbol of participation in the society's activities and conferences, making it a unique and special item for collectors interested in clubs and memberships.