Antique American Pen and Ink Drawing Signed Circa 1850

A stunning pen and ink drawing of eagles. The work is American, circa 1850 and is signed prominently on the front W. R. Bittle? The work is 28" by 22" including the frame, which is walnut with interior gilding. The frame and drawing are both in excellent condition though there is a tear to the paper, please see photo close-up. Guaranteed to be as described. This is truly a superb work of art!