Federal Artillery Button, eagle with "A". Button depicts eagle facing right with "A" in the shield, generally for artillery officers. Backmark: "(star) WATERBURY" remainder of backpack is worn. Dm inner ring of short hyphens (square dots) transitional use ca 1860 to post war. Two part convex button, cuff size. Shank is broken.
Reference: Albert AY78 /79, Tice AY215
Inventory Number: BUT 034