Jaeger-LeCoultre Mark XI (RAF-issued), 6B/346, Steel

The Jaeger-LeCoultre Mark 11, alongside its relatively more common sibling, the IWC Mark 11, is perhaps the finest military mechanical timepiece ever produced. It is estimated that only 2,950 were issued to the military, with none ever sold to the public. It can certainly lay claim to being the original Pilot’s watch, and one of the most expensive commissions by a military, anywhere. Issued by the British Ministry of Defence (MoD), these watches were made to the very strict 6B/346 specifications, and as such, are of incredibly high quality. They were issued to navigators in the Royal Air Force (RAF).