Apparently from an 1864 photograph by Anthony Berger (see weblink below).
Dimensions
Dimension Description
Framed Size
Height
20-1/2 in
Width
16-1/2 in
Research Notes
Notes
According to the weblink above, the portrait was issued as a "rush print" by Currier & Ives after Lincoln's assassination and there are other versions "with as many as a dozen subtle variations in costume and hair detail," some even with Lincoln facing right.