King of Prussia, Wilhelm I, c. 1865-1875.
Unknown photographer
between circa 1865 and circa 1875 <div style="display: none;">date QS:P,+1850-00-00T00:00:00Z/7,P1319,+1865-00-00T00:00:00Z/9,P1326,+1875-00-00T00:00:00Z/9,P1480,Q5727902</div>
Tufts Digital Library.