A very pleasing 16520 from 1991 - N serial number. Both reference and serial numbers fully visible between the lugs. The dial is in excellent condition with color change subdials. There is some slight aging on the center of the subdials. The case was recently refinished and is super sharp. The bezel is in excellent condition. The movement was serviced in the last 2 years and is running fine and keeping excellent time. This is a full collectors set with just about everything that came with it when it left the factory incl the original Rolex guarantee paper which was never filled in by the original owner.