I found this button at a site that can have some 1800s items to modern day. It is infested with nails so there are still some old finds there. I found this button there recently. I thought that it was a jeans button at first but it is made of solid metal and it looks like it has the remains of a shank on the back. I did a search for eagle with shield buttons and the closest to the pattern was for Republic of Texas buttons. The shield is different on this button because there is no sign of any pattern on it. Is it an older blazer button? It is small, just over 1/2" in diameter.