Thanks, EPK! The black military style one is a very cool watch. The one I sold years ago was a black military one from about 1942 (last days of Thiel brand, before communists took over?) and I was offered $140 for it. I think it was a short wehrmacht order and attracted attention among collectors. I'm keeping these, though.
Audiomagnate is right, I have no secrets, just enjoy it a lot and experiment with anything. The only secret of mine is that I have a lot of cheap expendable material for experimenting. So when I move to a watch restoration I have a vague idea what to expect. I sometimes make a mess of it. I just don't post my failures here :)
Thanks, Secondtime, for your valuable advice and help! Especially on the radium lume advice. The black one had a glass crystal that could not be polished (I couldn't anyway), so I found an acryllic Thiel for spares. Finding out how to polish glass is a future experiment. And yes, I noticed the UMF 2 shock protected ballance on both sub and central second hand. My Ruhla collector friend helped me with a movement for spares (umf 2, central second hand), so now I owe him one. It's been really hard finding UMF 2 movements, even broken for spares.