'Unidentified Soldier in Union Captain's Frock Coat and Officer's Sash with Sheathed Sword and Revolver (U.S. Civil War)':This artifact is a photograph of an unidentified soldier from the Union army during the United States Civil War, dressed in a captain's frock coat and wearing an officer's sash that bears undetermined insignia, along with a sheathed sword and revolver. The photograph serves as an important historical representation of a Union officer's uniform and military accessories during this period. The identity of the soldier remains unknown, adding to the intrigue surrounding this valuable piece of American history.