This was the official crest for the Celtic Harts Society, which was a Celtic society I started a ran for a few years back in the 90's. I had a heck of a time finding a Celtic version of a stag in my reference books! There were a few in some metalworks, and as well one in the Book of Kells. After figuring out the common characteristics among all the stags, I made my own "leaping stag", which I think comes closest to the style of the Kells stag I had found. Of course, the stag had to have "seven tines", as per proper Celtic mythology! The original also contains added touches of gold leaf, which do not appear in the poster edition.