Flat/Dandy Button?

Found this 0.02" (0.5 mm ) thick, 1.4" (35mm) diameter copper/brass disc buried about 9" deep in a colonial-era pasture-turned-to-woods. On the front side there are two concentric circles engraved and there are a few tiny gold-colored flecks. On the back, there are no markings and no discernible signs of a shank. The disc has a 'tear' in it, extending about half-way across the disc.

Could this be a flat or "dandy" button?

Thanks,
--Bert