This is a superb UNC note. I have listed as AUNC. The reason is that on the reverse, on the top left hand corner (see image) there is a light discolouration in faded green. I have looked at this along with a fellow collector. We agree it is from the original printing and is green ink. It is not sufficient to be classified as an error. It is a low serial number and similar notes are listed above this price. This is excellent value. Free UK postage.