aquatint (mezzotint?)

Handcolored aquatint (or mezzotint), mounted on cardboard, from "R. Ackermann's Yachting Scraps", plate 2, "The Sapphire/ (M. Gibson, Esqre.)" printed across bottom "Drawn by W.A. Knell. London: Published April 20, 1850, by Rudolph Ackermann, at his Eclipse Sporting & Military Gallery, 191 Regent Street. Edgd. by J. Harris." Scene shows British schooner yacht SAPPHIRE, starboard view, racing in a stiff breeze, mainsail has just parted from the boom, other sailboats in background.