Kunst-Anstalt J. B. Obernetter, Wilhelm Dreesen, Segel-Reefen from the portfolio Aus Schleswig-Holstein, paper, heliogravure, image size: height: 21,20 cm; width: 30,00 cm, inscribed: recto u.: in engraved letters: SEGEL-REEFEN, Heliograv?re J.B. Obe