The Faber-Castell 2/83N desktop rule (and its less common pocket-sized sibling, the 62/83N) is probably the most sought after slide rule, especially after Dr. Clifford Stoll's Scientific American article, When Slide Rules Ruled, drew attention to this epitome of slide rule development. As Dr. Stoll writes, the 2/83N "is considered by some to be the finest and most beautiful slide rule ever made."
I purchased this 2/83N directly from Faber-Castell as new old-stock. In other words, it sat unopened on the manufacturer's shelf since it was made, and has never seen the inside of an office or lab. I was the first to open it.