an integrated circuit which divided the huge frequency to produce pulses which ran the electromagnetic motor. These watches were the first to feature a time zone adjuster, which allowed the hour to be adjusted without interfering with the minute or second hand, this is a feature, followed through into the production watch alongside the later introduction of a second trimmer. The design of the calibre 1500 was modular, which translated into the production watch, however the movement design and layout of the final calibre 1511 and subsequent calibre 1516 was completely different. One of the major flaws of the calibre 1500 was battery consumption (from the twin cells), although untested until recently when one of the prototypes came to market as a running watch in 2011. The owner, Omega collector Thomas Dick, tested the watch and concluded that the battery life of the twin (344) cells was approximately 5 weeks, however the accuracy when bench tested was 0.03 seconds per day, still equating to 12 second per year. There were numerous other prototypes of the calibre 1510 watches, most of which were around case design, there are a number in private hands as well as a selection of prototype case designs and dial variations at the Omega museum in Bienne, Switzerland. These prototype watches were no calibre variations but alternative designs for cases and dials which ultimately led to the production watch. Production watches By 1974 Omega had developed a more stable production version of the original calibre 1500 Megaquartz. It was released to the market in two versions of 1000 units each. Calibre 1511: Marine Chronometer, this watch was certified at the Besançon Institute. All 1000 examples were sent to the Besançon in France for testing of their chronometer status and after 63 days of relentless testing (including temperature variation testing) the mean variation was less than two thousandth of a second per day. All 1000 watches were certified as Marine Chronometers and presented with certificates showing their individual performance over the 63-day period. The Marine Chronometer calibre 1511 was presented in a stainless steel case with integral bracelet with a solid 14-carat gold bezel and 14-carat gold plaque which bears the individual serial number of the movement. Of the 1000 calibre 1511 watches produced approximately 900 had solid 14-carat bezels and plaque and 100 had stainless steel bezels and plaques, specifically designed for the French market in response