There's a new collection on Familysearch.org that shows scans of original AL marriage documents from (currently) Bibb, Barbour, and other counties. That's where I found this:
Mike Flynn/Flinn and Britta Ann Green McGuire were married December 19, 1868, in Bibb County, AL. The bondsman was P. C. Bean, Pendleton Coleman Bean. The marriage book lists Britta as either Bretty or Betty, but if you look at the document it's clearly Britty or Bretty.