Hi Geary,
>Question is this, what was so precious about the clocks??
I suppose these were high-end clocks and rather expensive. I'm not sure, but I think they had to be subjected to the best possible care to maintain their accuracy, and leaving them in an aircraft that could be baking the in the summer heat or freezing in the cold of a winte night was not not good care for a precision instrument.
As they were removable, they were always threatened by theft, another reason to entrust them to the aircrews' personal care. As their lives could depend on precise navigation, and precuse navigation relied on an accurate clock, that was quite sensible.
As an aside, recently I was visting an exhibition on the famous 1950s' Mercedes 300 SL racing car with a couple of friends. (These were the original "Silver Arrows" - since on one occasion, they were 2 - 3 kg above specified weight, they were stripped of their paint and raced in bare - aluminium! - finish, starting the Mercedes tradition of silver racers.)
Anyway, our local aircraft cockpit expert pointed out the dashboard of one of the racers - it had a standard Luftwaffe instrument adapter right in the centre, featuring a standard Luftwaffe navigation clock :-)
Regards,
Henning (HoHun)