Pastoral - Moonlight (from Camera Work) A photogauve by Steichen (it's nice, it features sheep) sold at Christies last night for 3250. Three other photogauves from Camera work sold as one lot for 1825. None of these were later impressions, and all were printed from the late 1910s. In Feb 2006 an autochrome by Steichen was sold for 2.9m.

The photogauves are mass produced, and the autochromes are an edition of 3, and b/c of printing varrations de facto unique, but still, it doesnt explain the split.