The ultra-thin Calibre 711 is the non-Chronometer version of the Calibre 712, and is a very special movement for Omega.
The headline figure is the thickness which is only 3 mm. This compares to 3.6 mm in the much newer Calibre 1120 chronometer which is considered to be a very thin movement, and the 4.5 mm thick Calibre 551 which was Omega's flagship chronometer at the time. Even the famous Jaeger LeCoultre Calibre 920 is only slightly thinner at 2.45 mm.
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