The product is a CDV (Carte de Visite) featuring Brevet Major John S. Nimmon of the 11th Pennsylvania Cavalry during the Civil War era. This original piece was made in the United States and showcases the theme of militaria, making it a valuable artifact for history enthusiasts and collectors interested in the Civil War period. Brevet Major Nimmon's image and rank provide insight into the military hierarchy and tactics of the time, offering a unique glimpse into the civil war through the lens of a specific commander and unit.