This is a First Run in UNC grade and with a two digit serial number. It is an utterly wonderful and high quality banknote, very rare indeed and a superb banknote to add to the collection. Excellent offer. The marking on the left looks as if it is from the original print run. I have examined the note under the magnifying light for some time and the main mark, the spot above, and very light marks on the left vertical edge (seen only under magnification) indicate to me this is a clear inking issue. I take great care to grade all my notes carefully and am known to under-grade notes bought at auction. It is so important to be precise and exact. It would be unethical otherwise.