antique Martha Washington print, patriotic art American centennial vintage

Timeworn antique Americana piece, a framed Martha Washington portrait print with wood plank backing. We'd guess this is probably American centennial vintage, about 1876-1880. The print is marked Hallett, and measures 15 3/4" x 11 3/4" over the outside dimensions of the frame

The chromolitho is shabby and yellowed, and the frame is shabby and worn. There's no glass or backing paper on this piece, it's just the print and the plank loosely fit in the frame.