CDV by John Siegmund, over the Post Office, Rock Island, Ills. 1880's I believe.
John Gottlieb Siegmund was born in Germany , July 14, 1841. He was a photographer in Rock Island, Illinois from 1871 through 1892. Directories list him as a fruit grower thereafter. His wife was Margaret Meyser, married in 1875. Siegmund died in Rock Island on March 28, 1921.