IC 2681. There is nothing exactly at Wolf's position on his plate. However, examining the print of the plate carefully in January of 2015, I see two possible objects that may have been Wolf's intended nebula. One is the galaxy CGCG 067-048, and the other is a star to its northwest. The galaxy, however, appears stellar on the print of the plate, while the star seems to have a defect superposed that makes the object look like a planetary nebula as noted in Wolf's description.
I've put question marks on both objects, and suggest that there is some error in Wolf's measurement or reduction that threw his position off.