Thanks. The back has thrown me. Cant figure out for sure its a button. Also could find nothing with the arrow and an anchor. This is an old dugout most probably used 1860s to 1880s. Lots of spent pistol round but little else. Looks more like a temporary site possibly buffalo hunters. I found the coins in a small area also found a small round ground rock digging up one of the buttons. Found at the same site brass trigger guard from a colt pocket pistol year.