This shield-shaped badge was made by the Scovill Manufacturing Company of Waterbury, Connecticut around 1864. The Scovill Company was established in 1802 as a button manufacturer that is still in business today. Scovill was an early industrial American innovator, adapting armory manufacturing processes to mass-produce a variety of consumer goods including buttons, daguerreotype mats, and campaign badges.
This badge features a profile bust of a man in a uniform (likely George B. McClellan) facing left, and the rim of the shield is lined with 34 stars. Above the head of the man the legend reads: Union.