Requesting lookup of marriage for John Pinkerton/Pinks (his 2nd) and Henrietta Campbell.

Their first child was born about 1856, but rumor is that they may not have married until 10 years later. Therefore, I am looking at the years 1855-1857, or 1865-1870. I know this is an unusual request, but would appreciate any help I can get. Thank you for your time.