P.S. we would be very interested in hearing what your research turns up. Can you tell us what is it for? Please keep up updated.
Also worth bearing in mind is that various Cork Distillers used both Whiskey and Whisky.
A German whiskey enthusiast has a nice little site with pictures of labels and some of the first are of Cork distillers.
See
HERE Under Old Labels.
Note: If you intend using these pictures please ask the site creators permission as a common curtsy.