Most of you will know the IWC Mark series, however, Jaeger-LeCoultre has produced a similar watch in the past. The British Military of Defense (MoD) issued watches to navigators in the RAF and later on, also in the Australian RAAF. These watches have been produced by both Jaeger-LeCoultra and IWC. And as you can see below, they appear to be very similar.
With some help of Dale, I stumbled across a site called MarkEleven.com, that give a lot of background on the Jaeger-LeCoultre Mark 11 and tries to track them. A very interesting site, and project!