Tours - looking backwards; Robert Wallis; 1794-1878; British; after Joseph Mallord William Turner; 1775-1851; British; 1831; Line engraving; engraver's proof (early) on moderately thick; slightly textrued; beige; wove paper; Sheet: 8 9/16 x 11 3/4 inches (21.7 x 29.8 cm); Plate: 6 x 8 7/8 inches (15.2 x 22.5 cm); and Image: 3 11/16 x 5 1/2 inches (9.4 x 14 cm)