Omega Marine Chronometer Ref. 198.074 +COSC P

Dating to circa 1976, this Omega Marine Chronometer Ref. 198.074 comes from a period when the Swiss watch industry was throwing enormous resources at one question: just how accurate could a wristwatch become? Omega’s answer was the Megaquartz 2.4 MHz family, and the result still feels futuristic half a century later.

The architecture is pure seventies. A large rectangular steel case flows directly into the integrated bracelet, while the black dial is framed by a warm gold bezel. “Marine Chronometer” sits proudly across the top, the date is placed at six and the individual movement number appears on the gold plaque beneath the dial. On this example that number is 37,057,368.

Inside sits Omega’s quartz calibre 1510, part of the remarkable Megaquartz 2400 family. Its quartz resonator operates at roughly 2.4 million vibrations per second, many times faster than the 32,768 Hz frequency that later became the industry norm. Omega developed the system in pursuit of accuracy around one second per month, an extraordinary figure for the early 1970s.

The 1510 is particularly interesting because it is fundamentally very closely related to calibre 1511, the movement normally associated with the production Marine Chronometer. Both share the same high-frequency architecture, and documented early Ref. 198.074 examples fitted with calibre 1510 do exist.

There are clever details everywhere. The hour hand can be adjusted independently without disturbing the minutes and seconds, allowing the wearer to change time zones without sacrificing the precision the watch was built around. The small recessed corrector in the case flank is another reminder that this was designed as a serious precision instrument rather than simply an unusual-looking quartz watch.

And expensive precision it was. The Megaquartz 2.4 MHz watches sat at the very top end of Omega’s catalogue, costing several times more than a contemporary Speedmaster. This was quartz before quartz became cheap: ambitious, over-engineered and very much a prestige technology.

This example also retains its original papers, which feel especially appropriate for a watch whose identity revolves around measurable precision and technical achievement.

A 2.4 MHz Omega with calibre 1510, gold detailing, integrated-bracelet seventies design and one of the most excessive approaches to quartz precision ever put on the wrist. Calling it “just a quartz watch” really would miss the point. Available at Reestraat 3, Amsterdam.