The small ones look like they could be buttons? What are they made out of, where did you find them? That would help on getting an age. Is there any markings on them?
They were found around the old Mining camp of Rosita, CO. Everything else found dates 1870-90 top two are all brass third one iron with brass edge and the fourth one looks to be lead. Way too big for buttons
My first thought on the smaller ones was gaming tokens or poker chips. We need better pics of front and back of the items to try to make a positive ID.