Sinn NaBo 17 ZM from RAF Tornado ZA469
NaBo - NaBo stands for Navigation Borduhr, or on-board navigation clock.
ZM - Zentralminute - central minute counter
It has a bidirectional bezel. 3H Tritium dial & hands. The large black knurled crown at 6 o'clock winds up the movement with start/stop and reset buttons
Tornado Cockpit showing the NaBo 17ZM at the pilot's right

There are a few really cool things about his particular one:
1) Provenance - most cockpit clocks are pulled from generic aircraft however this one comes from a specific RAF Tornado plane Number ZA469
2) Accompanying paperwork/documentation (see below)
3) ZA469 flew combat IDS missions (interdiction/strike) against ISIS in Afghanistan
4) ZA469 is now on display at the Imperial War Museum Duxford (not rotting in a scrapyard)
An IWM spokeswoman said: "The Tornado GR4 is the most significant combat jet used by the Royal Air Force during the last 27 years and continues in service until 2019.
"The aircraft we've got – ZA 469 – was deployed to Afghanistan between 2011 and 2014, frequently operating in support of ground forces."
Wiki page on the Tornado: https://en.wikipedia.org/wiki/Panavia_Tornado
according to the documentation this from RAF Squadron 9 - Wiki page on Squadron 9: https://en.wikipedia.org/wiki/No._9_Squadron_RAF
Story goes that this clock eventually ran into problems - not unusual being banged around in a cockpit - and instead of being serviced it was simply replaced (again not unusual) with another one. It was sold as military surplus and eventually found its way to me.
I believe it runs a Valjoux 55 and will probably need to be properly serviced - Mike/RiverRat ?!?
Short video with a Tornado Pilot and Museum staff as it goes into Duxford:
Anyway - pictures:





