Being offered is an original black and white photographic negative of Chesapeake & Ohio Railway EMD F-7B diesel unit No. 7522.  The view is a 3/4 shot of the unit taken at an unknown location and date.  The identity of the photographer is unknown.  The negative measures approximately 2 1/4 x 3 1/4 inches, is well composed, properly exposed, and in sharp focus.  Not everyone bothered to shoot "B" units.  Fine shot that should make nice prints.