Things You'll Need
Instructions
Identify the design on the front of the button. It should have a state seal, which was incorporated into the button on Civil War uniforms.
Examine the button composition. Most Civil War uniform buttons were made of brass, silver plate or pewter. Brass is the most common.
Inspect the shank on the back of the button. The shank is a small loop used to attach the button with thread. The way the shank is attached indicates the era in which the button was manufactured. Civil War era buttons usually show a circular depression at the base of the button around the shank. A small, very round shank "eye" also indicates a Civil War period button. Shanks inset into holes in the button didn't happen until after World War I.
Inspect the button's "back mark." This is lettering on the back of the button which identifies the button manufacturer. Scovill &Co. Waterbury, Manufacturing was the most prolific military uniform button manufacturer during the Civil War. W.H. Horstmann &Sons was another popular button maker during that era.