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automatic question

I have some questions about the automatic winding system in a mechanical watch. I have viewed some technical exploded view-drawings on the internet of the omega 2500 calibre. How exactly is an automatic watch being wound? I know the weight spins around to wind it up, but does it wind a spring or torsion spring? I haven't seen it on pictures. And, is it true that a watch runs slower when it approaches the end of its power reserve, compared to when its fully wound up?

Greetings and thanx anyway for the answers!

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automatic question
Re: automatic question
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