This is an all original and UNCOMMON vintage 1977 (5 million serial) ROLEX AIR-KING Date in steel. The 35mm. stainless steel ROLEX OYSTER reference 5500 case displays EXCELLENT overall condition with the Rolex Oyster winding crown operating smoothly. The original dial is an unusual-slate coloured with even and attractive ageing-all lume plots intact. These AIR-KING DATES are the “hot ROLEX watch” at this time. This DATE variety of AIR-KING that was sold mainly in Canada and Commonwealth countries only. The date is the feature making it uncommon; as the regular and common AIR-KINGS do not have the date. The automatic winding ROLEX cal. 1520 movement was just cleaned and is accurate. I believe these watches will increase in value over time and are presently undervalued. This dial is amazing and rare to find in this slate gray.