brass back I think, not positive, the park is on a site of the towns first school which was there from 1850-1898BuckleBoy said:Band button. Might be closer to 1860ish...
http://www.cwbullet.net/cwbullet-org/bullet-relic-forum/viewtopic.php?f=16&t=3106&p=16184
The one in the link has battlefield provenance. What was the age of the site you were hunting? And I need to know if that is a tin back or a brass back on the button.