Description In 1977, after five years of design, development, and testing, Rolex introduced their first completely in-house quartz movements (the 5035 and 5055) and the Datejust (5035) and Day-Date (5055) Oysterquartz models that would house them. When they were introduced, the... Read More Product Detail In 1977, after five years of design, development, and testing, Rolex introduced their first completely in-house quartz movements (the 5035 and 5055) and the Datejust (5035) and Day-Date (5055) Oysterquartz models that would house them. When they were introduced, the 5035 and 5055 quartz modules were marvels of technology as well as fit and finish. These 11 jewel movements utilized the latest CMOS circuitry, a 32khz oscillator, and analog thermocompensation. In addition, they were finished to even higher standards than Rolex's mechanical movements. It is no exaggeration to say that even today, no quartz movement produced by any watch company can compare to the 5035/5055 from the standpoint of sheer beauty. For 25 years Rolex produced the Oysterquartz in Datejust models (17000 stainless steel, 17013 steel/YG, 17014 steel/WG), and Day-Date models in all gold (19018 YG, 19019 WG). Special models of the Oysterquartz were also produced with jeweled dials, bezels, and bracelets. It has been estimated that in all less than 25,000 Oysterquartz watches were ever produced