I'd take those find any day. I love digging artifacts like that. As far as the button goes my buddy dug one almost identical to yours that we've yet to identify. Does your button have any back marking? That's the key to identifying them. Size can tell you possible use. i.e. cuff, collar, bodice etc. the are some other key facts to note as well. Judging from you picture I'd say you have a two piece design with a looped back. Location of the find might also help determine civilian or military. Thanks for sharing.