In 10733 Danny recalled:
In my day, it was always the clock which went first, as they were wind-up jobs, attached to the panel with only four bolts, and would easily transfer to the dash of your old banger.
Which gives me the cue for a warning message. I too "acquired" an aircraft "glow-in-the-dark" dashboard clock ca. 1957 (I have forgotten what RAF plane it came from) which stayed with me as a treasured possession until I became a postgraduate student in Genetics in the University of Edinburgh, where it sat on my newly-acquired desk in my little labspace, in a room shared with several others. One of the others had started to work with radio-isotopic tracers and had a Geiger Counter, which he found was going nuts all the time.
Of course the radium paint on the numerals of my clock were to blame, emitting lots of hard (penetrating) Gamma-radiation. Sadly, the clock was immediately consigned to the radioactive waste disposal system and buried somewhere. Safety-first!