Dear OF members, First of all, thanks for the extensive knowledge shared here. I have learned a lot through reading your inputs and I have landed myself with an 145.012-67 (delivered on May 1968). ) This is my first vintage watch and I have some interesting (or maybe not) questions: When I’ve pull out the crown to adjust time, I noticed that almost every turns I made, there seem to be a feeling of gap ( drop? Jump? Incomplete? Don’t know how to call it). The hour and minutes hand would jerk abit and then back to normal and continue with next turn. Is this normal? What could be the problem? I have a speedy apollo 11 cal 863 before purchasing 145.012-67. I noticed that For Apollo 11, I just need to turn it 18-20 turn and the power reserve will last me a good 24-30 hours. However, when I do 18-20 turns for 145.012-67, the power would last me around 10-12 hours only. What is the problem? I have tried to wind the crown till it stop but it won’t. The crown just kept going until my fingers hurt.. that’s about 125 turns and it still kept going.... why is it so? Is this related to my question above? The hesalite crystal got some smudge/ stain on it (Ref picture attached- located on second sub dial). I’ve tried rubbing it off using water and cloth but it won’t work. Any suggestions what can I do to get rid of it? Thank you all for your valuable input.