Did Dunlop see NGC 6326?
John Herschel thought not. He wrote regarding NGC 6326 = h3675, (N.B. -- Referring to the description of Dunlop 381, I see no ground to suppose that this can by possibility have been the object intended by that place and description ['an extremely faint small nebula, about 12 arcseconds diameter, with a bright point in the centre']. At all events, the remarkable planetary character has escaped notice by the author of that description) sweeps 599 on 19/6/1835 and 789 on 6/6/1837.
Dunlop's position was out by 27.5' in pa 91 which is not unusual for him. The PN is magnitude 11 and Dunlop's limiting magnitude is 13 so he may have seen it, although its small 18" size makes it debatable.
Here are two images
http://www.ngcic.org/dss/n/6/n6326.jpg and
http://www.ucalgary.ca/~zhangc/pnimage.html
There are no IIS images of this PN.