JLC Mark XI
There is in the watch collecting world a dedicated group whose primary focus is on collecting military wristwatches.
The Jaeger-LeCoultre Mark XI is one of the most sought after and iconic watches within that genre. And this particular example shows why it is such a desired and important watch.
It has since been restored by one of the country’s foremost watchmakers.
More commonly known as the “Mk.XI" or "Mk.11,” the 6B/346 design reflected lessons
learned during the war and was much larger watch than most of the wartime 6B wristwatches.
The JLC calibre 488 SBr movement is a 12.5 ligne, 16-jewel work of art featuring Glucydur balance, Breguet-type Nivarox hairspring, non-magnetic curb pins, and amazing finishing. This movement was specific to the 6B/346 watches, whereas the calibre 89 used by IWC was used in many other watches.
The case back markings on this example place it as S/N 3292, with a movement serial number of 594867. This means our particular Mk XI was part of the third batch of watches ordered by the MOD in January 1949. The total number of JLC Mark XI's came to 2950 between 1948 and 1953.
It has a second-generation broad arrow dial and pointed hands combination, the standard RAF case back and fixed lugs. The case whilst worn and with scratches retains its light satin finish. The dial has aged hour markers but the numerals are now clean and bright. The matte black dial has also stood the test of time.




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