Brass, Ordnance Department Officer buttons. One of the few branches of the Federal service not to use a version of the Eagle button, the Ordnance Department prescribed this button for use by all officers assigned to it. This button may have been purchased and used by enlisted men as well.
Made by Waterbury, USA.
Large, approximately 7/8″, used on Great Coats and Frock Coats.
Small, approximately 5/8″, used on Caps, Vests, Cuffs, Overcoat Capes, etc.