The Jaeger-LeCoultre Mark XI is perhaps the finest military mechanical timepiece ever produced. It can certainly lay claim to being the original Pilot’s watch, and one of the most expensive commissions by a military, anywhere. Originally issued by the British Ministry of Defence (MoD), and later the Royal Australian Air Force (RAAF), these watches were made to the very strict 6B/346 specifications, and as such, are of an incredibly high quality.

Production numbers of the reference were typically limited - 2,950 JLC Mark XI  were produced, of which far fewer remain in the market today.

One of the important characteristics of the Mark XI was its need to be highly antimagnetic, achieved through the iron dial and iron dust-cap, which creates a Faraday cage, protecting the movement from magnetic fields.
Inside the watch, is perhaps its most impressive aspect, the JLC Calibre 488/SBr - a chronometer grade movement with a hacking device and center seconds. It is rhodium brass finished with Geneva stripes. The 35mm stainless steel case features long lugs, spring bars, screw-down case back and a domed plexiglass. One of the key differentiating factors of the RAAF Mark XI is the use of spring bars instead of traditional fixed bars of RAF watches, offering a degree of versatility and setting it apart from most other military watches of its kind. There were also variances in the hands Jaeger-LeCoultre used, with this example coming with syringe hands. The case-back features all of the correct engravings as designated when issued.
One ob e important characteristics ob e Mark XI was ist need ob e highly antimagnetic, achieved through the iron dial and iron dust-cap, which creates a Faraday cage, protecting the movement from magnetic fields.One of the important characteristics of the Mark XI was its need to be highly antimagnetic, achieved through the iron dial and iron dust-cap, which creates a Faraday cage, protecting the movement from magnetic fields.

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