Hello!
Great watch and congratulations! As for the hands, I'm 100% sure that in minutes it's the right time for the model, most likely the time. The crown has been replaced. For the dial, I have no idea what ultrasonic cleaning is and whether it will not damage it. With proper cleaning, only the middle part will become silver, and yours has an excellent color and patina and there is no need for that.
My CK 859 with caliber 30 from 1939. I had to clean it because it was very dirty where I have losses in the central part, but with you everything is even.
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