Mart, I did look up the names and that's how I came up with the year. George M. Dallas was 11th Vice President of the United States (1845–1849) and Mayor of Philadelphia from 1828–1829. Robert E. Pattison was the 19th Governor of Pennsylvania from 1883 to 1887 and 1891 to 1895, This paper I think references Pattison for election in 1882 for Governor of Pennsylvania from 1883 to 1887. There is a close up of 1 of the nails in the frame in the 8th photo image, the long part of the nail is square.