I've always thought the fronts of all the National Gold Bank Notes were pretty impressive, and the back is phenomenal. Of course the fronts are essentially the same as the First Charter Nationals except for the yellow tint, so that circles back to post #1 of this thread!
When I stop and really think about it, all the large size notes were impressive. Both from the engraving standpoint, and with many, great coloring besides. I can't say I see a real looser in the bunch.
Full disclosure: This is one I don't own, except in my dreams. But wouldn't it make a great souvenir card?