Can you folks help identify this button found near three others. The folks there claim it was Civil War. While tempted to say Excelsior, I do not see the 4 divisions in the shield at all, but either what looks like a bird, and insect or an aeroplane. It says on the back Brattleboro, Mass. It has 13 stars and an eagle on top looking left. Anybody have info on this one? Thanks, Osgood