Its a nice button but not a civil war button. I have a friend that has hunted a long time and never found a civil war button. He's still looking for his first bullet. Great find.
Dman
Well we know since the button did not exist until 1902 that it is 20th century and the Scovill backmark, which is blurry but it looks like the generic backmark that has a date range of 1860 into 20th century, Scovill ceased in 1970 to make buttons. In 1995 where the button factory stood, they tore it down and now a shopping center is there.