Animate Stereoscopic Portrait of General Grant at His Headquarters at Cold Harbor, Virginia (1864)

Animated stereoscopic portrait of General Ulysses S. Grant at his headquarters in Cold Harbor, Virginia, July 1864. Photographer Mathew Brady is adjusting a reflector on the left. Attributed to Mathew Brady. Published by E. & H. T. Anthony & Company. Animated stereoview.

Source.
Negative version.