Model of the midships section of H.M.S. 'Challenger', 1872-76 expedition, scale 1:12, by Severn-Lamb Ltd., Stratford-upon-Avon, England, 1976-77. Model of Midships Section, HMS Challenger (1872-76 Expedition), 1976-77 1872-1876 (expedition); 1976-1977 (model)