N.C. Dahl was a pupil of C.W. Eckersberg and later in life helped his teacher paint complicated rigging as Eckersberg's sight faded. This is a typical painting from Eckersberg's school, assigned to Dahl. Pen and watercolour, 49.4 x 34.5 cm. Source: Hanne Poulsen, <i>Danske Skibsportrætmalere</i>, page 52 &amp; 55.
Niels Carl Dahl (1812-1865)
N.C. Dahl painting, scanned from book